Typically what happens when you launch a full screen progam, it blacks out your second monitor (since it has to run in 'fullscreen' mode). But if that's not the case, then when you try to manipulate the second monitor it takes presedence and minimizes your fullscreen application on the main monitor. Or, all control is restricted to the full screen application and you get to watch blankly at your second monitor as a beautiful potato.
But I think this is more of the way how MS Windows is programmed to handle full screen programs.

The only way to accomplish what you want would require the glide game to run in a *window* on the second monitor port. Then yes, I think it might be possible (I've never tried it, and I don't know if glide games run in windowed mode).

Thanks for the reply!

I've got an LCD monitor that has both VGA and DVI inputs on it. I'm eventually going to try to set it up with one of my PCs so that VGA is connected to the Voodoo card and DVI is connected to the GeForce primary vga card. I'm pretty sure I can just use the monitor's built-in display switcher to choose which card I want to view, thus eliminating the pass-thru cable entirely. Technically, it should work.

I was hoping that perhaps the Matrox DualHead hardware/software might be able to go one step further and show both at the same time. Sadly, it doesn't sound possible.

On both dualview capable 3Dlabs and nvidia cards, what you want with Voodoo2 is not possible IME. The Voodoo2 cannot run windowed mode, and when its in 3D the other outputs (actually even the loop-thru output) are unusable when the application on the V2 has preference. If you minimize that, you can do whatever you want on the other displays ofc. DirectX does not handle minimizing efficiently (the renderer is unloaded and must restart - some games can handle this, others crash); I don't know how glide handles that though.

I don't see how the dualview Matrox card would in any way behave differently than the 3Dlabs or nvidia cards.

Now, if you had a VGA input on the PC and looped the V2 into that (with no 2D connection), you may be able to do what you want. But performancve may not be great - remember you're running a game along with whatever else you want.

The switching on the monitor would work, as would having a monitor just for the Voodoo. Note that you will likely have to manually switch the monitor onto the VGA input for the Voodoo.

I actually did try using both monitor inputs with my P4 build - GF4 to DVI and Voodoo 2 SLI to VGA on my Acer S202HL 20 inch LED. It worked, but switching had to be done manually (at times I would forget and realize I was waiting for no good reason at all 😅 ) and the Acer was sometimes a bit slow to react (it would take up to 30 seconds before the VGA input became active). After a few days I just used the passthrough cable and connected both to the VGA input; it was just too much of a hassle for me. A separate monitor would probably work much better with a Voodoo 1/2 card - if you have the extra room available 😊