? Possible to use wifi adapter as an AP?

Hi, im a newb when it comes to wifi, or wireless networking, so i wanted to ask for help here.

I was wondering if it was possible to use a USB wifi adapter as an access point for other devices to conenct to. The adapter i have is just a USB stick which looks like a flash drive or mp3 player.

I installed the drivers for it, and tried to setup a wireless network, but it says it cannot find any networks. So i'm assuming that i need an access point

I'm trying to use the USB wifi adapter to play online games on my Nintendo DS. I bought this one instead of the original nintendo one simply because it was cheaper. I bought it in ebay and it said it was meant for psp/ds wifi gaming. But it only came with psp instructions involving making an adhoc network.

Any ideas?