Auditing printing

I have a requirement to monitor two (2) things: 1. Print to file 2. Print to (printer) device What is the best approach for this? I don't see a syscall that looks appropriate - but that doesn't mean there is not one. Would I simply do an audit on the *lpr* command? Or is it another command? I need the ability to monitor printing to both file and device, *FROM*, linux shell as well as console or GUI. Can someone advise me on how to accomplish this please? Thanks in advance, -------------------------- Warron French