Printer monitor project

[Aaron]

Hi, I've been given the task of writing a program which will monitor how many pages have been printed on the printer attached to a system, and after a certain number have been printed, it will print a page of its own. The system could be a network printer server, or just a desktop system. Ideally, it should not be written as a printer dirver. I could use some help with ideas as to how to approach this. Thanks, Aaron