Network Printing...

Problem: I am working on a application which should be able to print across any of the user specified printers. There are 600 printers , conneted directly on the network , some printers through HP Jet500 printserver. This printserver can support 3 printers on 3 ports. My application will run on only one or 2 servers. I can copy the drivers. But how do i connect and print on those printers , if i know the IP address. How do i USE TCPMon ,part of windows print services. I am trying to use the windows GDI.
thanks