Well, as Eclypz noted, the exact process will depend on the game. Most modern games go through an internet server for online play, so you would just each need to have an account on the relevant server and the two machines wouldn't have to communicate directly.
Some multiplayer games allow or require you to run your own server, in which case you could fire that up on one of the two laptops, then get that laptop's IP by clicking Start and typing "cmd" in the "Search programs and files" box and hit Enter, and in the command window that pops up, type "ipconfig" and hit Enter. You should then see something like this:
Quote:
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . : vf.shawcable.net
Link-local IPv6 Address . . . . . : fe80::8cbd:5ebe:4c53:d545%12
IPv4 Address. . . . . . . . . . . : 192.168.0.195
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1
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You'd then use the "IPv4 Address" on the second laptop to connect to the one with the server.