Latitude 5540 Owner's Manual

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Image: Base view

Power button with optional fingerprint reader
Press to turn on the computer if it is turned off, in sleep state, or in hibernate state.
When the computer is turned on, press the power button to put the computer into sleep state; press and hold the power button for 10 seconds to force shut-down the computer.
If the power button has a fingerprint reader, place your finger on the power button steadily to log in.
NOTE:The power-status light on the power button is available only on computers without the fingerprint reader. Computers that are shipped with the fingerprint reader that is integrated on the power button will not have the power-status light on the power button.
NOTE:The power-button behavior can be customized in the operating system.
Keyboard
Fingerprint reader (optional)
Press your finger on the fingerprint reader to log in to your computer. The fingerprint reader enables your computer to recognize your fingerprints as a password.
NOTE:Configure the fingerprint reader to register your fingerprint and enable access.
NFC/Contactless smart card reader (optional)
Touchpad
Move your finger on the touchpad to move the mouse pointer. Tap to left-click and two fingers tap to right-click.

Touchpad
Move your finger on the touchpad to move the mouse pointer. Tap to left-click and two fingers tap to right-click.
Left-click area
Press to left-click.
Right-click area
Press to right-click.
Power button
Press to turn on the computer if it is turned off, in sleep state, or in hibernate state.
When the computer is turned on, press the power button to put the computer into sleep state; press and hold the power button for 10 seconds to force shut-down the computer.
NOTE:You can customize the power-button behavior in Windows. For more information, see Me and My Dell at Dell Support Mannuals.