Nvidia Geforce 9200m GS

Hey Guys, Dudes, Nerds, Geeks, Girls, Patrck Stewart Fans (Joking)and Hardware Buffs.

I have a pretty nifty Nvidia 9200m GS video card in my laptop, its a few years old but compared to the GMA 950 in my old netbook its brillaint!

Something (Thanks to Steam) I've been wondering about, can modern day games (GTA IV for example) detect shared memory on top of the dedicated 256mb VRAM my Laptop has?

If so this would allow me to play similar games at higher resoulutions and details   and would make me look towars getting a RAM upgrade to the holy 4 for Vista.

Thanks!