Dell Studio 1558 (Early 2010) - Manual (Page 104)

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Shutting Down Your Computer
Docking and Undocking Your Laptop Computer
Undocking Your Computer While it is Running— Hot Undocking
Advanced Configuration and Power Interface (ACPI) is a form of power
management, that enables the operating system to control the amount of
power given to each device attached to the computer.
If your computer is ACPI-enabled, you can undock it while it is still running,
without shutting down open applications or programs.
To determine if your computer is ACPI-enabled:
Windows Vista
1 Click Start → Control Panel→ System and Maintenance→
System →Device Manager (listed under Tasks).
2 If a window appears asking for permission to continue, click Continue.
3 Look for the System devices. If your computer is ACPI-enabled, ACPI will
appear next to the device name.
Windows XP
1 Click Start → Control Panel→ Performance and
Maintenance.
2 Click Administrative Tools→ Computer Management→ Device
Manager.
OR
Click System
→ System Properties→ Hardware→ Device Manager.
3 Look for the System devices. If your computer is ACPI-enabled, ACPI will
appear next to the device name.
Undocking Without Shutting Down
1 Save any open files.
FOR MORE INFORMATION: To learn more about undocking your laptop
computer, see the documentation that came with your computer and
the documentation that came with your docking station.