Standby Hockey Trader I'm sure that somebody who doesn't have PMS will be happy to answer your questions.
A standard Windows computer can handle up to 16 video screens (monitors) on 4 quad video cards if it has enough wattage and CPU power. You can run two monitors on any dual video card or 4 monitors on a quad card. Dual cards can be had on eBay for $20 and up while quad cards are about $30 and up. Top of the line cards can go as high as $1500. Average is about $100 for a good quad card. More monitors is simply like having a single large monitor. The mouse moves freely from one screen to another.
If the screens are side by side, as you move your mouse pointer past the side of one monitor, it appears on the adjacent edge of the other monitor - of course you first need to tell the operating system how your monitors are arranged, so it knows which edges are aligned, but that's just a matter of dragging icons around. In use, applications can just be dragged around to any monitor you choose.
Now, you can also get a USB video card like this: http://www.buy.com/prod/startech-co...itor-video-adapter-4/q/loc/101/202919823.html I don't know much about them except that they exist. As I understand it, they may not be fast enough for intense gaming, but for a trader's purpose of even the most complicated charts, they should be fine. And you're not limited by the number of slots in your computer.
There was a similar device offered by EVGA, but did not work with 64bit op systems. No info on this device as to compatibility.
I just bought this for my laptop so i can spread accross 3 screens and for the price i have been disappointed. If oyu leave something alone for view only its fine but if you want to interact on that screen it doesnt act well.