✔ 最佳答案
It's quicker to have multiple displays than it is to switch between views as the eye can move faster than the computer can redraw. There's a tremendous advantage to having the extra display space. Stock trading isn't the only profession where multiple screens are in demand.
The software is likely to be specific to the exchanges that they are trading on and there's likely to be several different programs running some developed in house and some perhaps even the traders own bag of tricks. In it's heyday, Wallstreet would have one well paid systems administrator between two or three traders so that technical issues would not impede the traders. In the past, the computers were Unix based scientific workstations such as Sun and SGI, hence the system administrator and therefore had slightly different keyboard layouts than a PC. These days PC's are used as scientific workstations with Linux providing all the functionality of Unix and Windows starting to be a reasonable OS, of course, they're not limited to the computers at their desk, those displays could easily be of programs running on a number of servers in a machine room.