Well, here at work they use TIvoli endpoint. I haven't seen it from the control side, I just know it is installed on my desktop and some of it's features.

Basically it will let you remotely monitor workstations and stuff like that. You can do a remote desktop and software uploads etc... YOu might want to check it out. ALthough as far as I know it doesn't run in stealth mode, so the user will know it is there.