Don't understand printing

[Jim Patterson <jim_patterson@xxxxxxxxxxx>]

I have set up some printers on my FC3 system and they have worked fine 
up until now.  I don't know what changed, but I was printing pdf files 
using ggv a week ago and today I can't seem to get one to print.   The 
files just seem to hang in the print queue.

I looked at the preferences in ggv and saw that it printed using 
/usr/bin/lpr.  I'm not quite sure how this ties into cups or if it does.