get vnc or something - however: most schools don't like that cause its really bandwidth stressing.
Its a remotedesktop program btw. A Virtual PC or Virtual machine runs another machine on your current real machine. look for VMWare or CoLinux for examples.
I have a BootDVD of my important PC data (I update it often) and when i put that in the drive i can just boot a copy of my operating system / programs / files on another persons pc without installing anything