multi-player gaming on wireless network... how??

Following is the main requirement:
I want to connect to my friend's computer (in my society) who is also using wireless Dlink router mainly to play games and share files.
I have checked using a laptop, my friend's wireless signal is reachable @ my place.

is it possible to play games on this wireless network.
if yes, 1. then which router should i go for ?
2. can this router also server for my wireless broadband ?

Or shoud i only go for wireless receiver?

I have Hathway Broadband internet @ home