video card settings

i have a few questions about video card:

1. Is there a way to know how much vram the pc is currently using?

2. Is there a way to set how much vram you want?(Ex. if you have 128 mb, for some reason you might want the pc to use only 64mb)

why would you want to use the system memory instead of the memory built into the video card? What type/manufacturer is the video card?

Is this an on-board video card that uses system memory?

Actual plug-in (AGP or PCI) graphics cards have their own dedicated memory. They do not use the system memory, and the amount they use is not variable. They have a fixed maximum amount, and they'll use what they need.

If you have 256Meg of system ram, and a 256Meg video card (a separate card, not on-board), you can't shift 128Meg of that video ram over to your system, and have more ram in your system - but then, if you can afford a 256Meg video card, you can afford to buy a gig of ram for your box

one more question
for example, if a game requires a minimum of 192 MB system ram and 64 vram, can't the game makers provide an alternative system requirement of 128 mb for the system memory and 128 vram???

Nope, because it doesn't work that way. Video can't perform all the functions that an x86 based processor can, and vice versa.