How do I hook up 2 computers to one printer?

I Have 1 hp pavilion w/Windows XP and (1) with Windows 7?

My main computer has a printer hook up to it. But how can I hook my labtop up to that printer so that I can hit print from my labtop and it print out from the printer?

I have two computers on my desk at home, but only one printer. Is it possible to hook both of the computers to the same printer?

Is it a splitter of some sort? I know printer sharing settings must be set but how do you physically hook up two computers? Thank you for responding.

i am trying to hook up 3 computers, which are side by side in a small room, to one printer. There is a modem with a 4port switch i believe to hook up the other computers, which all have internet access. The printer only has a USB connection. anything...

how do I hook more then one computer to one printer all my computers are hooked up through a router for the internet but are otherwise independant. The printer is hooked up directly to one computer which is the only one that I can print on.