Finding Domains, then searching for machines on each

Hi All,

Does anyone know how to search for domains present on your network? After seeing them, I would like to select a domain, then search for machines logged into it.

Does anyone have code or know how to do this?

It's fairly trivial, but it sounds as if you're going to do something you shouldn't be doing, so you'd have to convince me that I'm wrong first.

I'm a network admin in my company, and I'm just trying to make my life a little easier when I'm trying to find my users.