My GeForce card on my box at home has two plugs: A VGA plug, and a DVI plug.

I noticed that there were some cables lying around the lab here at work that looked kinda like Y-adapters for DVI plugs.

I'm considering purchasing a second monitor for my home setup. (Once I've got money again, that is.) If I did this, must I use the VGA plug for that purpose, or would one of those Y-adapter thingys work some kind of magic that allows my GeForce card to drive both monitors digitally?