Alt-Tab; hold the 'Alt' key in, and press 'Tab' until the window you want to use is selected. The, release both keys.
Backspace
It locks the computer
In some old windows computers the spacebar can be used to turn on the computer.
alt+tab
Windows logo key + E
Windows 98: You can't (using the Operating System) Windows 2000: CTL+ALT+DEL then choose "Lock Computer" Windows XP: Same as Windows 2000 or use shortcut Windows Key + L
ALT+TAB
Windows key+D ,minimizes all the stuff to your task bar
A list of Windows shortcut keys can be found online on the Microsoft Windows website. To be sure that the list of short cuts is relevant to your PC, be sure you have the list that pertains to the version(XP, 7, 8) of Windows you are using.
Finding the list of shortcut keys in the Windows operating systems can be found in a couple of major locations. The most common is the Microsoft site itself, with others including Computer Hope and Google Support.
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In Windows, create a shortcut with the shutdown /s command. If the shortcut is on your Start Menu or Quick Launch bar, it will only require one click. If the shortcut is located on your Desktop or in another folder, it will require two clicks. Most monitors have Power Saving features and will turn off when no signal is detected.