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In reference to How can I get the same SSID for multiple access points?, particularly this line
Wireless clients just assume that all APs with the same SSID are configured similarly and are all just different points of access to the same underlying wired network.
I was wondering if this applies to networks that are on different wired networks. For example let's say that John Doe has a network named Doe Internet, and Jane Doe who lives nearby has the same SSID, Doe Internet, and neither of them have a password protection, will wireless devices such as laptops and phones roam freely from one network to the other? Is there a way to configure access points on different wired networks to act as the same network?
Bonus question: does this pose security threats to people who could potentially enter onto a malicious network created by an attacker, using the same name as a nearby network?
--EDIT--
I guess I wasn't clear enough with my question. I would like to make two access points for two different wired networks look like one network, is this possible?
--EDIT #2--
Everyone should obviously use a password on all WiFi networks always, this scenario was just to create the dead simplest example possible.
Any unsecured wifi pose some risk. A bad guy pulls up to your neighborhood and connects to your wifi, because it is open, and worst case situation triggers a (miles away)bomb and drives off unnoticed. The computer will default attach to the access point of SSID with strongest signal. – cybernard – 2014-07-20T19:26:20.763
Comment based on your edit: Yes it is possible, but if they are different networks behind it, it may give weird results. If the idea is purely to share internet, the problem will not be that big, as the closest one will be connected to until you get out or reach. Do note that using no password is a bad idea, and when abused, it is likely that the affected network will lose the internet connection by shutdown from the ISP due to illegal activities. – LPChip – 2014-07-21T12:09:50.637