The only thing that distinguishes one wireless AP from another (for the purposes of establishing a wireless connection) is the SSID, security type, and network key. The MAC address of the router is irrelevant as far as the client is concerned (of course, that doesn’t mean the router couldn’t reject a client MAC address using MAC filtering). If those three parameters match more than one wireless router, and the wireless protocol (a/b/g/n) is mutually compatible, then it's entirely possible your PC could connect to any one of them. That is in fact what makes wireless roaming possible. And when neighbors buying the same product leave them configured w/ their defaults, can result in UNINTENTIONAL wireless roaming! Of course, signal strength and range will play a part in determining the likelihood of that happening.