Stories We Like: A Guide to the Comma
A guest on the system, especially one who generally logs in over a network from a remote location for comm mode, electronic mail, games and other trivial purposes. A tourist is one step below a luser.
Hackers often spell this turist, perhaps by some sort of tenuous analogy with luser (this also expresses the ITS culture's penchant for six-letterisms).
Compare twink, read-only user.