Shutdown or restart Computer in the network

1) Start>>Run and type cmd and press Enter.
2) type shutdown /i
3) add the computers on your network ,set the display timing and enter the shutdown

Usage: shutdown [-i -l -s -r -a] [-f] [-m \\computername] [-t xx] [-c "comment"] [-d up:xx:yy]
No args => Display this message (same as -?)
-i => Display GUI interface, must be the first option
-l => Log off (cannot be used with -m option)
-s => Shutdown the computer
-r => Shutdown and restart the computer
-a => Abort a system shutdown
-m \\computername => Remote computer to shutdown/restart/abort
-t xx => Set timeout for shutdown to xx seconds
-c "comment" => Shutdown comment (maximum of 127 characters)
-f => Forces running applications to close without warning
-d [u][p]:xx:yy => The reason code for the shutdown
u is the user code
p is a planned shutdown code
xx is the major reason code (positive integer less than 256)
yy is the minor reason code (positive integer less than 65536)

For more see the link for win2000 http://support.microsoft.com/kb/317371