I was over at SysInternals yesterday, downloading a new version of the most excellent Process Explorer, and I had a bit of a look around to see what else was cool. The answer, of course, is...everything. But I was particularly impressed by PsExec, a tool that gives you telnet-like shell connectivity to another machine without having to install anything on the remote machine!! I just run
psexec \\avalon cmd.exe
and like magic I have a command prompt that displays on my local machine that is actually executing commands over on the remote machine (avalon in my example). I repeat: without having to install anything on the remote machine. You can launch GUI applications, but they show up on the remote machine. Regardless, it's still killer for command-line guys like me.
I love it, but how the hell do they do that?