RemoteShutdown allows to remotely (over the network) shutdown and power off, restart or switch to standby mode any Windows NT/2000/XP Workstation or Server.
In addition, you can specify a message which will be displayed before the computer will be shutdown and offer the user the option to cancel the shutdown.

All you have to do is to start RemShutDn.exe. You will see the following screen:

Select the computer from your domain or workgroup by clicking "Bowse" button, or if computer is not from your domain or workgroup you have to typein the name.
You can also specify additional options (ie. message like on the picture )
And press "OK".
On the selected computer following messagebox will appear.

 
If you click on "OK" and the "Display Message" check box is not ticked, then an immediate shutdown will occur.

Download Remote Shutdown GUI application (freeware)
http://www.matcode.com/remshutdn.exe (125 KB)

See also:
Wake-On-LAN