is there such a thing as a reverse traceroute program? what i would like to do is trace from a remote computer back to one at uni for an assignment...

ive already traced to a few computers in our campus WAN, but i now want to trace back the other way from the computers in the WAN to the one im using in the unix lab, is it possible to do this somehow without having a user account on the remote machine, or is ths not possible?