One Monitor, Many Computers

Hi All

I have a SOHO setup. I frequently have to monitor what's going on my computers. At any time, 4-8 computers are on. I wish there was a way I could eliminate all those monitors and keyboards and get one large 37" LCD instead that will display all the computers' displays in that one screen. Each display in its own window. A KVM solution will show me one computer at a time. Which is fine but doesnt meet my requirements. I need to see all the computers at the same time, on one screen. And control them all through one keyboard and mouse. Something you'd see on a CCTV monitor. Upto 4 little sections on the display, each playing a different video stream. Only, I need something for computers.

P.S. I cannot install any software on the machine. They are new computers, changing all the time. I install the OS and do a burn-in test and then despatch it to clients.

Any suggestions would be greatly appreciated.

Thanks