wireless network setup

I have XP home on 2 pc’s and Me on another. Will a Netgear MA111 wireless network adapter 802.11b inserted into a USB port in a notebook pc send data wirelessly from the wireless access point device that is connected to the wired router that I presently have that is connected to the cable modem at the base station pc?
Does the access point device connect to the wired router that I already have so I don’t have to buy a wireless router,only the wireless access point device?