To do this:	Use these keys
Cancel a print or copy job:	Command(Apple)+period(.)
Zap PRAM:	Command(Apple)+Option+P+R
Force restart:	Command(Apple)+Control+Power Key
Shutdown:	Power Key
Bypass current startup device:	Command+Option+Shift+Delete
Change the menu entry from 'About this Macintosh' to 'About the Finder'	Hold down the Option key while choosing the About document under the Apple menu.
Clean up the Icons	Hold down the Option key while choosing Clean Up By Name from the Special menu.
Align icon to a grid	Hold down the Command key and drag then release the icon.
Close all windows at Startup	Hold down the Option key.
Copy selected items to Clipboard	Command+c
Cut selected items to Clipboard	Command+x
Paste selected items from Clipboard	Command+v
Select the last file in an open box	tilde (~)
Disable virtual memory	Hold down the Command key at Startup
Eject floppy disks	Command+y Command+Shift+1 (one) Command+Shift+0 (zero) Command+e
Erase floppy disk	Hold down Command+Option+Tab while inserting the disk.
Open Extension Manager at Startup	Hold down the Space Bar
Force quit an application	Command+Option+Escape
Rebuild the Desktop on the Mac	Start or restart the computer while holding down the Command+ Option keys.
Rebuild the Desktop on the floppy disk	Insert the floppy disk while holding down the Command+ Option keys.
Screen dump to file	Command+Shift+3
Select all items in the active window	Command+a
Startup from CD-ROM	Hold down c while starting.
Delete locked files	Hold down the Option key and drag the file to the trash.
Startup with extensions off	Hold down the shift key at startup until you see 'Welcome to Macintosh. Extensions off.'
Undo the last editing command	Command+z
Close the active window	Command+w
Close all windows	Command+Option+w
Return to the Finder with no windows open	Hold down the Option key while starting or quitting an application.

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