Operating System (OS)
A bar that inform you the available options in your computer, opened applications, background running applications and can be used to switch between applications quickly is

Task bar
Status bar
Menu bar
Tool bar

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Operating System (OS)
What is the meaning of "Hibernate" in Windows XP/Windows 7?

Restart the Computer in safe mode
Shutdown the Computer without closing the running applications
Shutdown the Computer terminating all the running applications
Restart the Computer in hibernate mode

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