My experience has been that you don't do much but sort of like putting your answering machine between your jack and phone or putting your VCR between your cable and TV. Two printers into back of switchbox, one cable from switchbox to printer. Bother printers must be "connected" in Printers-Setup to the same port. If you have HPs, I believe you might (tho I'm not sure if it's true) need to have a "special" or "expensive" cable. I've heard more than once that if you don't have the "better" cable, they just don't work. I think my cable cost a few more than the old generic one. I have a scanner and printer on a switchbox, and the printer and external Zip are on one cable. No problems.