Using multiple PC monitors is a great idea for boosting productivity. For example, when you use two monitors instead of one it makes it easier to read something on one monitor while keeping an eye on something else on the other.
This is a great solution for those with overcrowded desktops and professionals who work on several programs simultaneously. Usually, its IT professionals such as IT consultants or programmers who may want these double PC monitors. It's also cheaper to purchase an additional smaller monitor than to replace your smaller monitor with a large 30 inch model. You'll get more screen space with two 22 inch monitors as well. If you want to add an extra monitor, you must first ensure that it will be supported by your PC. Computers with more than one video output will most likely support an extra monitor. Another option is to install a cheap graphics card in a PCIx slot.