Lan.FS is a very quick, small and compact freeware network tool (for non-commercial use only) for Windows 2000/XP/2003/Vista & Windows 7.
Some features are:
Messenger with animated emoticons
Filetransfer service with statusdisplay
Remote Desktop functions to telecommand other computers in your network
Remote Shell function for access to the systemprompt of other computers in your network.
Access to the whole filesystem of other computers
Windows commands (reboot, shutdown, user switch, run) on other computers