LAN Shutdown Manager can remote shutdown of the machine. It allows you to run a very slim client on a Windows workstation that allows remote shutdown of the machine.
The shutdown manager is command-line driven, with a few simple options to control shutdown of specific machines, broadcast, warnings, and scripting. These instructions are intended for a LAN administrator, so concepts and terms are NOT explained.

Load the client software on each workstation you wish to have control over. I suggest putting this in the load= or run= lines in win.ini. Why not the startup group? Because the software will survive a logout, so if the someone were to log out, then log in, Windows will run the client twice and give the user an error. I can remove that, but its a pain. Now, install the manager onto another machine. Do NOT run the client there, or you are likely to shut yourself down accidentally.

Open up a command prompt and try a few things:
MANAGER List the running shutdown clients
MANAGER REBOOT Will reboot all machines
MANAGER REBOOT * Same thing
MANAGER SHUTDOWN computer-name Shutdown a single computer
MANAGER SPEAK Display an annoying message
MANAGER QUIT Close the shutdown client
MANAGER /? Useful help information
The commands are case-sensitive -- use all caps.

The license of this software is Free, you can free download and free use this shutdown software.