Connecting 2 wireless CPE's through AP to make a network

Here is what I have now. 2 house with one wireless CPE on each connecting to the same AP in the middle of town. This is how we each connect to our ISP but both have our own accounts (we are not tring to share a connection), we want to play games (joint ops) between houses. Our ISP is not the fastest but faster than dial-up. So we are thinking it would be a fast connection passing thru the AP.

All computers are running winxp

As I said before each house has its own wirless CPE

House #1
From the CPE the RJ45 runs into a dlink di604 wired router, there are 2 computers hooked to this and everything is running on the 192.168.1.x subnet. Joint Ops can be played between perfect here.

House #1 computer 1 is 192.168.1.51 and computer 2 is 192.168.1.52

The CPE for House #1 is on 10.0.0.45 subnet and DMZ'ed to 192.168.1.51

House #2 has 1 computer running the 192.168.1.x subnet and the CPE is dmz'ed to 192.168.1.50. House #2 CPE is also on the 10.0.0.48 subnet and dmz'ed to 192.168.1.50

We are working with the wireless internet guys but they are at a stand still too. They are the ones that have dmz'ed their routers in the CPE to see if this will work.

A little about the Joint Ops game is one computer will host and the other computers will search and then join. There is no inputting an ip manually it does what they say is a broadcast to find a host. Bascilly we need a wireless lan between the house to see each others computers before we can connect to the game.

All 3 parties (myself, house #2 and the internet guys) are needing advice.

Please be blunt and forward.

Thanks.
Willing to try about anything at this point.