Using Apple Remote Desktop, you can control multiple client computers simultaneously, issuing commands that are found in Mac OS X's Apple menu (Log Out, Sleep, Restart, etc.), as well as other commands.

See:

• Opening Files and Folders
• Opening Applications
• Putting a Computer to Sleep
• Waking Up a Computer
• Locking a Computer Screen
• Displaying a Custom Picture on a Locked Screen
• Unlocking a Computer Screen
• Disabling a Computer Screen
• Logging Out the Current User
• Restarting a Computer
• Shutting Down a Computer
• Starting Up a Computer