Network App

Does anyone know of any utilities that can monitor the list of computers on a network and notify the user if a new machine is added?

Also, is their an API call or something that you use to find out how many computers are on a network? Lets say i wanted to have a list of computers in a listbox in VB..how would I add all of the computers on my network into that listbox?

Thanks.

NET USE will tell you who is logged on to a computer. search for NET USE and you will find an api that works better. I saw it yesterday.

found it.
here

Oh excellent..thank you.