Virtual Window Manager for OSX ???

Back in the DOS / Windows days, there were programs that allowed you to create a virtual display space so that if you had a 800 x 600 screen, you could specify you wanted a 1024x768 screen (or higher). This was wonderful for laptops that had limited resolution but you were running apps requiring a higher screen size. When you reached the edge of the screen, the window would automatically scroll until you hit the limit of the virtual screen size. Mac OSX has this feature with the CMD-OPT-+ key when you zoom in your screen. Works the same way.

I need a program that does this for OS X (specifically for an X11 session). The app was writter at 1280 x 1024 but the G4 iMac can only display a maximum resolution of 1024 x 768.

I've looked at the virtual desktops out there, but they all seem to partition the screen into workspaces. What I really need is a single-session (not multiple desktop) virtual window manager to allow me to specify the size of the monitor that I want to emulate.

Can anyone here help? Is there such a program for OS X?

 

Anybody?

I did notice some same XF86config files that listed monitors and resolution, plus it have a listing for specifying "Virtual" screen size and how an oversized virtual screen appears on the monitor. Does anyone know if this works with OS X and if it does, how to configure it?