You can buy a switch box that have that allows you to connect two computers to one monitor and switch back and forth as you wish. You would three cables. I
You need to buy a KVM or KM switch also called a Keyboard/Video/Mouse switch which will allow you to swap between two or more PC using only 1 monitor.
Good companies doing this are:
Belkin...
It is possible to use two monitors and hopefully this will help you. 1. First you must consider the power usage of using two monitors. If you are not concerned about this, then you can move on. 2. Do...
For most PCs, it's as easy as getting a second display card. Some of the more recent computer won't let you do that. You will need to buy a special dual monitor display card.