Yep. Should show up in System Preferences > Displays. You can make either display the "home" display by dragging the menu bar from one to the other. Drag the secondary display around the primary to arrange it the way you like (usually trying to emulate the physical layout of the displays).
edit: whew - I'm slow. spinnerlys beat me AND with screen shot (well, I only have a single at the moment, so that wouldn't have been much help 😉 )