It has nothing to do with the application itself, rather it would depend entirely on the printer you're using, how it's connected to the machine, are there drivers installed for it, and how you want to print. Somehow, of all the POS printers I've seen used, very seldom would you go through the Windows printing system to print a page on one of these things. Normally, I've just seen direct printing to either a COM port or LPT port the printer is connected to. You can even printer to a USB based printer if it's drivers expose it on a COM port to applications.
A guide to posting questions on CodeProject[^]
Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
2006, 2007