How Do I Reduce Viewable Area?

[aBetterUsername]

Hi!
I just finished doing the overhead projector/LCD panel thing and IT WORKED! This is especially amazing, seeing as I had to chisel some of the silicon wafer away to free six immovable screws. Violence and technology or not, everything's working great and looks just like the pics in the tutorial. There's a problem that wasn't addressed in the tutorial, though: The projector stage is 10.5" by 10.5", and while the whole unit perfectly seats a 15" LCD, obviously a maximum of 10.5" is viewable on the wall. While I was shopping for an overhead, I kept running into that problem, but the absolute biggest stage size is 14" by something, so no matter what this issue is going to keep coming up. I figured I'd just reduce the "size of the screen" via the display control panel...

...I've since learned there's apparently no way whatsoever to do that intentionally. I say "intentionally" because I've crashed out of games and seen the "shrunken screen" effect I'm going for in the past. How do I achieve this manually? The monitor is a CTX S501a and the OSD menu only offers horizontal and vertical POSITION, no scaling. There must be a way to accomplish this! Help!

Thanks a lot and sorry for the length of this!

 

[aBetterUsername]

That won't help. The actual screen size initially displayed by the monitor must be reduced. The light stage is 10.5", the monitor 15". Is there no software that can do this?

 

[aBetterUsername]

The simplicity of the problem is driving me NUTS. I need like "SHRINKMONITOR.EXE" or something.