From Rational Soft:
Hidden Administrator software is designed to administrate remote computers via a local network or the Internet. It gives full access to the remote computer from anywhere in the world, display the remote PC desktop in real time, controlling the remote desktop with the keyboard and mouse, monitoring several computers simultaneously (up to 256 computers), and file exchange. It automatically searches for running servers (searching for computers to connect to) and you can watch video on the remote computer. It also features transferring sound over the network in real time, switching computers on remotely (Wake on LAN), exchanging messages with the user (Chat), high performance rate and minimum traffic usage over the LAN and Internet, and switching off and restarting the remote PC.