With the proper combination of parameter values, you can set up your users in such a way that all their printed output goes to a specific printer, no matter where they have signed on.
The proper combination is one of the following (xxx is the name of the desired printer):
OUTQ(*DEV) PRTDEV(XXX) in the job description.
OUTQ(*USRPRF) in the job description, and OUTQ(*DEV) PRTDEV(XXX) in the user profile.