This is instructable will show you how to shutdown a computer (from your own) remotely. there is no need to send a file sneak on their computer or have any contact with them. This requires little or no DOS skills although it will help if you are 1337
first type "net view"
next find you target in the list (by the way the target needs to be on your network)
congratz you've found your target.
by the way its also easier if u can sneak a peek at their computer for a minute. if you can click start right click my computer click properties then go to computer name. but thats only if theres alot of computers like in an office or a school.