HP EliteBook 1040 G4 User Manual

User Guide

© Copyright 2017 HP Development Company,

L.P.

Bluetooth is a trademark owned by its proprietor and used by HP Inc. under license. Intel, Celeron, Pentium, and Thunderbolt are trademarks of Intel Corporation in the U.S. and other countries. Windows is either a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries.

The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

First Edition: September 2017

Document Part Number: L00438-001

Product notice

This user guide describes features that are common to most models. Some features may not be available on your computer.

Not all features are available in all editions or versions of Windows. Systems may require upgraded and/or separately purchased hardware, drivers, software or BIOS update to take full advantage of Windows functionality. Windows 10 is automatically updated, which is always enabled. ISP fees may apply and additional requirements may apply over time for updates. See http://www.microsoft.com.

To access the latest user guides, go to http://www.hp.com/support, and follow the instructions to find your product. Then select

User Guides.

Software terms

By installing, copying, downloading, or otherwise using any software product preinstalled on this computer, you agree to be bound by the terms of the HP End User License Agreement (EULA). If you do not accept these license terms, your sole remedy is to return the entire unused product (hardware and software) within 14 days for a full refund subject to the refund policy of your seller.

For any further information or to request a full refund of the price of the computer, please contact your seller.

Safety warning notice

WARNING! To reduce the possibility of heat-related injuries or of overheating the computer, do not place the computer directly on your lap or obstruct the computer air vents. Use the computer only on a hard, at surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft surface, such as pillows or rugs or clothing, to block air ow. Also, do not allow the AC adapter to come into contact with the skin or a soft surface, such as pillows or rugs or clothing, during operation. The computer and the AC adapter comply with the user-accessible surface temperature limits defined by the International Standard for Safety of Information Technology Equipment (IEC 60950).

iii

iv Safety warning notice

Processor configur tion setting (select products only)

IMPORTANT: Select computer products are configured with an Intel® Pentium® N35xx/N37xx series or a Celeron® N28xx/N29xx/N30xx/N31xx series processor and a Windows® operating system. If your computer is configured as described, do not change the processor configur tion setting in msconfig.exe from 4 or 2 processors to 1 processor. If you do so, your computer will not restart. You will have to perform a factory reset to restore the original settings.

v

vi Processor configuration setting (select products only)

Table of contents

1 Welcome .......................................................................................................................................................	1
Finding information ...............................................................................................................................................	2
2 Components ..................................................................................................................................................	4
Locating hardware .................................................................................................................................................	4
Locating software ..................................................................................................................................................	4
Right .......................................................................................................................................................................	5
Left .........................................................................................................................................................................	6
Display ....................................................................................................................................................................	7
Keyboard area ........................................................................................................................................................	8
TouchPad .............................................................................................................................................	8
Lights ...................................................................................................................................................	9
Button, speakers, and fingerprint reader .........................................................................................	10
Special keys .......................................................................................................................................	12
Action keys ........................................................................................................................................	13
Hot keys (select products only) .........................................................................................................	14
Bottom .................................................................................................................................................................	15
Rear ......................................................................................................................................................................	16
Labels ...................................................................................................................................................................	17
Inserting a SIM card (select products only) .........................................................................................................	19
3 Network connections ...................................................................................................................................	20
Connecting to a wireless network .......................................................................................................................	20
Using the wireless controls ...............................................................................................................	20
Wireless button ...............................................................................................................	20
Operating system controls .............................................................................................	20
Connecting to a WLAN .......................................................................................................................	21
Using HP Mobile Broadband (select products only) ..........................................................................	21
Using HP Mobile Connect Pro (select products only) ........................................................................	22
Using GPS (select products only) ......................................................................................................	22
Using Bluetooth wireless devices (select products only) .................................................................	22
Connecting Bluetooth devices ........................................................................................	22
Using NFC to share information (select products only) ....................................................................	22
Sharing ............................................................................................................................	23
Connecting to a wired network ............................................................................................................................	24
Connecting to a local area network (LAN) (select products only) ....................................................	24

vii

Using HP LAN-WLAN Protection (select products only) ....................................................................	25
Turning on and customizing HP LAN-WLAN Protection .................................................	25
Using HP MAC Address Manager to identify your computer on a network (select products only) .....................	25
Turning on and customizing the system MAC address .....................................................................	25
4 Navigating the screen ..................................................................................................................................	27
Using TouchPad and touch screen gestures ........................................................................................................	27
Tap .....................................................................................................................................................	27
Two-finger pinch zoom .....................................................................................................................	28
Two-finger slide (TouchPad only) .....................................................................................................	28
Two-finger tap (TouchPad only) ........................................................................................................	28
our-finger tap (TouchPad only) .......................................................................................................	29
Three-finger swipe (TouchPad only) .................................................................................................	29
One-finger slide (touch screen only) .................................................................................................	30
Using an optional keyboard or mouse .................................................................................................................	30
Using an on-screen keyboard (select products only) ..........................................................................................	30
5 Entertainment features ...............................................................................................................................	31
Using a camera (select products only) ................................................................................................................	31
Using audio ..........................................................................................................................................................	31
Connecting speakers .........................................................................................................................	31
Connecting headphones ....................................................................................................................	31
Connecting headsets .........................................................................................................................	32
Using sound settings .........................................................................................................................	32
Using video ..........................................................................................................................................................	32
Connecting video devices using a USB Type-C cable (select products only) ....................................	32
Connecting video devices using an HDMI cable (select products only) ............................................	33
Setting up HDMI audio ....................................................................................................	34
Discovering and connecting wired displays using MultiStream Transport ......................................	34
Connect displays to computers with Intel graphics (with a built-in hub) ......................	35
Discovering and connecting to Miracast-compatible wireless displays (select products only) ......	35
6 Managing power ..........................................................................................................................................	36
Using Sleep and Hibernation ...............................................................................................................................	36
Initiating and exiting Sleep ...............................................................................................................	36
Initiating and exiting Hibernation (select products only) .................................................................	37
Shutting down (turning off the computer ..........................................................................................................	37
Using the Power icon and Power Options ............................................................................................................	38
Running on battery power ...................................................................................................................................	38
Using HP Fast Charge (select products only) ....................................................................................	38

viii

Displaying battery charge .................................................................................................................	38
Finding battery information in HP Support Assistant (select products only) ..................................	39
Conserving battery power .................................................................................................................	39
Identifying low battery levels ...........................................................................................................	39
Resolving a low battery level ............................................................................................................	40
Resolving a low battery level when external power is available ...................................	40
Resolving a low battery level when no power source is available .................................	40
Resolving a low battery level when the computer cannot exit Hibernation ..................	40
Factory-sealed battery ......................................................................................................................	40
Running on external power .................................................................................................................................	40
7 Security ......................................................................................................................................................	42
Protecting the computer .....................................................................................................................................	42
Using passwords ..................................................................................................................................................	42
Setting passwords in Windows .........................................................................................................	43
Setting passwords in Computer Setup .............................................................................................	44
Managing a BIOS administrator password ........................................................................................	44
Entering a BIOS administrator password .......................................................................	46
Using DriveLock Security Options .....................................................................................................	46
Selecting Automatic DriveLock (select products only) ...................................................	46
Enabling Automatic DriveLock .....................................................................	46
Disabling Automatic DriveLock ....................................................................	47
Entering an Automatic DriveLock password ................................................	47
Selecting manual DriveLock ...........................................................................................	47
Setting a DriveLock master password .........................................................	48
Enabling DriveLock and setting a DriveLock user password .........................................	48
Disabling DriveLock ........................................................................................................	49
Entering a DriveLock password ......................................................................................	49
Changing a DriveLock password .....................................................................................	49
Using Windows Hello (select products only) .......................................................................................................	50
Using antivirus software ......................................................................................................................................	50
Using firewall software ........................................................................................................................................	50
Installing software updates .................................................................................................................................	51
Using HP Client Security (select products only) ..................................................................................................	51
Using HP Touchpoint Manager (select products only) ........................................................................................	51
Using an optional security cable (select products only) .....................................................................................	51
Using a fingerprint reader (select products only) ...............................................................................................	52
Locating the fingerprint reader .........................................................................................................	52
8 Maintenance ...............................................................................................................................................	53
Improving performance .......................................................................................................................................	53

ix

Using Disk Defragmenter ..................................................................................................................	53
Using Disk Cleanup ............................................................................................................................	53
Using HP 3D DriveGuard (select products only) ................................................................................	53
Identifying HP 3D DriveGuard status ..............................................................................	54
Updating programs and drivers ..........................................................................................................................	54
Cleaning your computer ......................................................................................................................................	54
Cleaning procedures ..........................................................................................................................	54
Cleaning the display ........................................................................................................	55
Cleaning the sides or cover .............................................................................................	55
Cleaning the TouchPad, keyboard, or mouse (select products only) .............................	55
Traveling with or shipping your computer ..........................................................................................................	55
9 Backing up, restoring, and recovering ...........................................................................................................	57
Creating recovery media and backups ................................................................................................................	57
Creating HP Recovery media (select products only) .........................................................................	57
Using Windows tools ...........................................................................................................................................	58
Restore and recovery ...........................................................................................................................................	59
Recovering using HP Recovery Manager ...........................................................................................	59
What you need to know before you get started .............................................................	59
Using the HP Recovery partition (select products only) .................................................	60
Using HP Recovery media to recover ..............................................................................	60
Changing the computer boot order ................................................................................	61
Removing the HP Recovery partition (select products only) .........................................	61
10 Computer Setup (BIOS), TPM, and HP Sure Start ............................................................................................	62
Using Computer Setup .........................................................................................................................................	62
Starting Computer Setup ..................................................................................................................	62
Using a USB keyboard or USB mouse to start Computer Setup (BIOS) ..........................	62
Navigating and selecting in Computer Setup ...................................................................................	62
Restoring factory settings in Computer Setup .................................................................................	63
Updating the BIOS .............................................................................................................................	63
Determining the BIOS version .........................................................................................	63
Downloading a BIOS update ...........................................................................................	64
Changing the boot order using the f9 prompt ..................................................................................	65
TPM BIOS settings (select products only) ...........................................................................................................	65
Using HP Sure Start (select products only) .........................................................................................................	65
11 Using HP PC Hardware Diagnostics (UEFI) .....................................................................................................	66
Downloading HP PC Hardware Diagnostics (UEFI) to a USB device ....................................................................	67

x

12	Specific tions ............................................................................................................................................	68
	Input power ..........................................................................................................................................................	68
	Operating environment .......................................................................................................................................	68
13	Electrostatic Discharge ..............................................................................................................................	69
14	Accessibility ..............................................................................................................................................	70
	Supported assistive technologies .......................................................................................................................	70
	Contacting support ..............................................................................................................................................	70
Index .............................................................................................................................................................		71

xi

xii

1Welcome

After you set up and register the computer, we recommend the following steps to get the most out of your smart investment:

● TIP: To quickly return to the computer Start screen from an open app or the Windows desktop, press the Windows key on your keyboard. Pressing the Windows key again will return you to the previous screen.

●Connect to the Internet—Set up your wired or wireless network so that you can connect to the Internet. For more information, see Network connections on page 20.

●Update your antivirus software—Protect your computer from damage caused by viruses. The software is preinstalled on the computer. For more information, see Using antivirus software on page 50.

●Get to know your computer—Learn about your computer features. See Components on page 4 and Navigating the screen on page 27 for additional information.

●Find installed software—Access a list of the software preinstalled on the computer: Select the Start button.

‒ or –

	Right-click the Start button, and then select Apps and Features.
●	Back up your hard drive by creating recovery discs or a recovery ash drive. See Backing up, restoring,
	and recovering on page 57.

1

Finding information

To locate resources that provide product details, how-to information, and more, use this table.

Resource	Contents
Setup Instructions	●	Overview of computer setup and features
HP support	●	Online chat with an HP technician
For HP support, go to http://www.hp.com/support.	●	Support telephone numbers
	●	Replacement parts videos (select products only)
	●	Maintenance and service guides
	●	HP service center locations
Safety & Comfort Guide	●	Proper workstation setup
To access this guide:	●	Guidelines for posture and work habits that increase your comfort
▲ Select the Start button, select HP Help and Support,		and decrease your risk of injury
	●
and then select HP Documentation.		Electrical and mechanical safety information

‒ or –

▲Select the Start button, select HP, and then select HP Documentation.

‒ or –

▲Go to http://www.hp.com/ergo.

IMPORTANT: You must be connected to the Internet to access the latest version of the user guide.

Regulatory, Safety and Environmental Notices	●	Important regulatory notices, including information about proper
To access this document:		battery disposal, if needed.

▲Select the Start button, select HP Help and Support, and then select HP Documentation.

‒ or –

▲Select the Start button, select HP, and then select HP Documentation.

Limited Warranty*

●

Specific warranty information about this computer

To access this document:

▲Select the Start button, select HP Help and Support, and then select HP Documentation.

‒ or –

▲Select the Start button, select HP, and then select HP Documentation.

‒ or –

▲Go to http://www.hp.com/go/orderdocuments.

IMPORTANT: You must be connected to the Internet to access the latest version of the user guide.

*You can find your HP Limited Warranty located with the user guides on your product and/or on the CD or DVD provided in the box. In some countries or regions, HP may provide a printed warranty in the box. For countries or regions where the warranty is not provided in printed format, you can request a copy from http://www.hp.com/go/orderdocuments. For products purchased in Asia Pacific, you

2 Chapter 1 Welcome

Resource

Contents

can write to HP at POD, PO Box 161, Kitchener Road Post Office, Singapore 912006. Include your product name, and your name, phone number, and postal address.

Finding information

3

2Components

Your computer features top-rated components. This chapter provides details about your components, where they're located, and how they work.

Locating hardware

To find out what hardware is installed on your computer:

▲Type device manager in the taskbar search box, and then select the Device Manager app.

A list displays all the devices installed on your computer.

For information about system hardware components and the system BIOS version number, press fn+esc (select products only).

Locating software

To find out what software is installed on your computer:

▲Select the Start button. ‒ or –

Right-click the Start button, and then select Apps and Features.

4Chapter 2 Components

Right

Component		Description
(1)	Micro SIM card slot	Supports a wireless subscriber identity module (SIM) card.
		For SIM card installation steps, see Inserting a SIM card (select
		products only) on page 19.
(2)	HDMI port	Connects an optional video or audio device, such as a high-
		definition television, any compatible digital or audio
		component, or a high-speed High Definition Multimedia
		Interface (HDMI) device.
(3)	USB 3.x SuperSpeed port with HP Sleep and	Connects a USB device, provides high-speed data transfer, and
	Charge	even when the computer is off, charges most products such as a
		cell phone, camera, activity tracker, or smartwatch.
(4)	Battery light	When AC power is connected:
		●	White: The battery charge is greater than 90 percent.
		●	Amber: The battery charge is from 0 to 90 percent.
		●	Off The battery is not charging.
		When AC power is disconnected (battery not charging):
		●	Blinking amber: The battery has reached a low battery
			level. When the battery has reached a critical battery level,
			the battery light begins blinking rapidly.
		●	Off The battery is not charging.
(5)	USB Type-C power connector and Thunderbolt	Connect an AC adapter that has a USB Type-C connector,
	port with HP Sleep and Charge (2)	supplying power to the computer and, if needed, charging the

computer battery.

– and –

Connect and charge most USB devices that have a Type-C connector, such as a cell phone, camera, activity tracker, or smartwatch, and provides high-speed data transfer.

NOTE: Cables and/or adapters (purchased separately) may be required.

– and –

Connect a display device that has a USB Type-C connector, providing DisplayPort output.

NOTE: Your computer may also support a Thunderbolt docking station.

Right 5

Left

Component		Description
(1)	Security cable slot	Attaches an optional security cable to the computer.
		NOTE: The security cable is designed to act as a deterrent, but
		it may not prevent the computer from being mishandled or
		stolen.
(2)	Vent	Enables air ow to cool internal components.
		NOTE: The computer fan starts up automatically to cool
		internal components and prevent overheating. It is normal for
		the internal fan to cycle on and off during routine operation.
(3)	USB 3.x SuperSpeed port with HP Sleep and	Connects a USB device, provides high-speed data transfer, and
	Charge	even when the computer is off, charges most products such as a
		cell phone, camera, activity tracker, or smartwatch.
(4)	Audio-out (headphone)/Audio-in (microphone)	Connects optional powered stereo speakers, headphones,
	combo jack	earbuds, a headset, or a television audio cable. Also connects an
		optional headset microphone. This jack does not support
		optional standalone microphones.
		WARNING! To reduce the risk of personal injury, adjust the
		volume before putting on headphones, earbuds, or a headset.
		For additional safety information, refer to the Regulatory,
		Safety, and Environmental Notices.
		To access this guide:
		1.	Type support in the taskbar search box, and then select
			the HP Support Assistant app.
			‒ or –
			Click the question mark icon in the taskbar.
		2.	Select My PC, select the Specific tions tab, and then
			select User Guides.

NOTE: When a device is connected to the jack, the computer speakers are disabled.

6Chapter 2 Components

Display

Component		Description
(1)	WWAN antennas*	Send and receive wireless signals to communicate with wireless wide
		area networks (WWANs).
(2)	Camera lights	On: One or more cameras are in use.
(3)	Internal microphones	Record sound.
(4)	Cameras	Allow you to video chat, record video, and record still images. To use
		your camera, see Using a camera (select products only) on page 31.
		Some cameras also allow a facial recognition logon to Windows,
		instead of a password logon. For more information, see Using
		Windows Hello (select products only) on page 50.
		NOTE: Camera functions vary depending on the camera hardware
		and software installed on your product.
(5)	WLAN antennas*	Send and receive wireless signals to communicate with wireless local
		area networks (WLANs).

*The antennas are not visible from the outside of the computer. For optimal transmission, keep the areas immediately around the antennas free from obstructions.

For wireless regulatory notices, see the section of the Regulatory, Safety, and Environmental Notices that applies to your country or region.

To access this guide:

1.Type support in the taskbar search box, and then select the HP Support Assistant app.

‒ or –

Click the question mark icon in the taskbar.

2. Select My PC, select the Specific tions tab, and then select User Guides.

Display 7

Keyboard area

TouchPad

Component		Description
(1)	TouchPad zone	Reads your finger gestures to move the pointer or activate
		items on the screen.
(2)	Left TouchPad button	Functions like the left button on an external mouse.
(3)	Near Field Communications (NFC) tapping area	Allows you to wirelessly share information when you tap it with
	and antenna* (select products only)	an NFC-enabled device.
(4)	Right TouchPad button	Functions like the right button on an external mouse.

*The antenna is not visible from the outside of the computer. For optimal transmission, keep the area immediately around the antenna free from obstructions.

For wireless regulatory notices, see the section of the Regulatory, Safety, and Environmental Notices that applies to your country or region.

To access this guide:

1.Type support in the taskbar search box, and then select the HP Support Assistant app.

‒ or –

Click the question mark icon in the taskbar.

2. Select My PC, select the Specific tions tab, and then select User Guides.

8Chapter 2 Components

Lights

Component		Description
(1)	Power light	●	On: The computer is on.
		●	Blinking: The computer is in the Sleep state, a power-saving
			state. The computer shuts off power to the display and
			other unneeded components.
		●	Off The computer is off or in Hibernation. Hibernation is a
			power-saving state that uses the least amount of power.
(2)	Caps lock light	On: Caps lock is on, which switches the key input to all capital
		letters.
(3)	Privacy key light	On: Privacy screen is on, which helps prevent side-angle viewing.
(4)	Fn lock light	On: The fn key is locked. For more information, see Hot keys
		(select products only) on page 14.
(5)	Mute light	●	On: Computer sound is off.
		●	Off Computer sound is on.
(6)	Microphone mute light	●	On: Microphone is off.
		●	Off Microphone is on.
(7)	Num lk light	On: Num lock is on.
(8)	Wireless light	On: An integrated wireless device, such as a wireless local area
		network (WLAN) device and/or a Bluetooth® device, is on.
		NOTE: On some models, the wireless light is amber when all
		wireless devices are off.
(9)	Keyboard backlight	Illuminates the keyboard for higher visibility in low-light
		conditions.

Keyboard area

9

Component		Description
(9)	Sharing or presenting light	On: Sharing is on.
(10)	Call answer light	On: Call answer is on.
(11)	Call end light	On: Call end is on.

Button, speakers, and fingerprint reader

Component		Description
(1)	Power button	●	When the computer is off, press the button to turn on the
			computer.
		●	When the computer is on, press the button brie y to initiate
			Sleep.
		●	When the computer is in the Sleep state, press the button
			brie y to exit Sleep.
		●	When the computer is in Hibernation, press the button
			brie y to exit Hibernation.

CAUTION: Pressing and holding down the power button results in the loss of unsaved information.

10 Chapter 2 Components

Component		Description
		If the computer has stopped responding and shutdown
		procedures are ineffective, press and hold the power button for at
		least 5 seconds to turn off the computer.
		To learn more about your power settings, see your power
		options.
		▲	and then select
		Right-click the Power meter icon
		Power Options.
(2)	Speakers	Produce sound.
(3)	Fingerprint reader (select products only)	Allows a fingerprint logon to Windows, instead of a password
		logon.

Keyboard area 11

Special keys

Component		Description
(1)	esc key	Displays system information when pressed in combination with
		the fn key.
(2)	fn key	Executes frequently used system functions when pressed in
		combination with another key. Such key combinations are called
		hot keys.
		See Hot keys (select products only) on page 14.
(3)	Windows key	Opens the Start menu.
		NOTE: Pressing the Windows key again will close the Start
		menu.
(4)	Action keys	Execute frequently used system functions.
		See Action keys on page 13.
(5)	Embedded numeric keypad	A numeric keypad superimposed over the keyboard alphabet
		keys. When fn+num lk is pressed, the keypad can be used like an
		external numeric keypad. Each key on the keypad performs the
		function indicated by the icon in the upper-right corner of the
		key.
		NOTE: If the keypad function is active when the computer is
		turned off, that function is reinstated when the computer is
		turned back on.
(6)	Windows application key	Displays options for a selected object.
(7)	num lk key	Turns the embedded numeric keypad on and off when pressed in
		combination with the fn key.

12 Chapter 2 Components

Action keys

An action key performs the function indicated by the icon on the key. To determine which keys are on your product, see Special keys on page 12.

▲To use an action key, press and hold the key.

Icon	Description
	Switches the screen image among display devices connected to the system. For example, if a monitor is
	connected to the computer, repeatedly pressing the key alternates the screen image from computer display
	to monitor display to simultaneous display on both the computer and monitor.
	Helps prevent side-angle viewing from onlookers. If needed, decrease or increase brightness for well-lit or
	darker environments. Press the key again to turn off the privacy screen.
	NOTE: To quickly turn on the highest privacy setting, press fn+p.

	Decreases the screen brightness incrementally as long as you hold down the key.
	Increases the screen brightness incrementally as long as you hold down the key.
	Mutes or restores speaker sound.
	Decreases speaker volume incrementally while you hold down the key.
	Increases speaker volume incrementally while you hold down the key.
	Mutes the microphone.
	Turns the keyboard backlight off or on.
	NOTE: To conserve battery power, turn off this feature.
num lk key	Turns the embedded numeric keypad on and off.
	Turns the wireless feature on or off.
	NOTE: A wireless network must be set up before a wireless connection is possible.
	Provides quick access to your Skype for Business calendar.
	NOTE: This feature requires Skype® for Business or Lync® 2013 running on Microsoft Exchange or Office
	365® servers.

Keyboard area 13

Icon	Description
	Turns the screen sharing function on or off.
	NOTE: This feature requires Skype for Business or Lync 2013 running on Microsoft Exchange or Office 365
	servers.
	●	Answers a call.
	●	Starts a call during a 1-on-1 chat.
	●	Places a call on hold.
	NOTE: This feature requires Skype for Business or Lync 2013 running on Microsoft Exchange or Office 365
	servers.
	●	Ends a call.
	●	Declines incoming calls.
	●	Ends screen sharing.
	NOTE: This feature requires Skype for Business or Lync 2013 running on Microsoft Exchange or Office 365
	servers.

NOTE: The action key feature is enabled at the factory. You can disable this feature by pressing and holding the fn key and the left shift key. The fn lock light will turn on. After you have disabled the action key feature, you can still perform each function by pressing the fn key in combination with the appropriate action key.

Hot keys (select products only)

A hot key is the combination of the fn key and another key.

To use a hot key:

▲Press the fn key, and then press one of the keys listed in the following table.

Key Description

CTurns on scroll lock.

ETurns on the insert function.

RBreaks the operation.

SSends a programing query.

WPauses the operation.

14 Chapter 2 Components