The other day, I ran into a new (to me) blog that I'm going to start reading. It's called Boiling Linux and Windows (they also do some AIX). If you're a cross platform admin like I am, it's probably worth your while to check it out. I know I'm very light in Windows experience, so it's an educational site for me.
Anyway, last week they covered running commands on a remote host from a Windows machine to another Windows machine. The tool used is psexec, which seems like a combination of rcp and rsh. I say that because I don't actually think the communication is encrypted, according to this conversation. Still, it's an interesting idea.