Looking for prog that notices window change and copies or prints

Under Windows XP I'm looking for a program that will run in the background and will notice screen/window changes and then either print or capture the whole screen.
For instance, the Printers window is typically always blank and only when a print job is available will you see the print job show up with document name, status, owner, pages, size, submitted and port filled in and then go away when done printing.

I'd like to be able to leave the Printers window open and have a prog capture the window each time a print job shows on the normally empty screen. I can then review after a while to see what print jobs went to the printer during that time.

Anyone help?

Thanks!
forthill