I don't know of any. VNC will do this in a *nix environment, but not in any Windows environments (95 et al & 2k et al). You can use a 'no mouse, no keyboard' setting in VNC which won't disturb the desktop in M$ but if you want to do anything other than observe the desktop, that's not too useful. I know that in W2k (XP?) that a lot of the administrative tools can be run remotely (with appropriate permissions) without disturbing the desktop. HTH.

-Zeke