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Inverse Protection!

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Given a function, f : D -> C, a function g : C -> D is called a left inverse for f if for all d in D, g (f d) = d and a right inverse if, for all c in C, f (g c) = c and an inverse if both conditions hold. Only an injection has a left inverse, only a surjection has a right inverse and only a bijection has inverses. The inverse of f is often written as f with a -1 superscript.

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The obvious thing that will not work is seamless roaming between multiple access points.

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Oh yes it will...

All I can say is that it doesn't (more accurately, didn't) for me.

I've recently reconfigured and simplified my network after a relocation, but I was running 5 APs: a wireless router + two further APs (using channels 1, 6, 11) and two Repeaters (on the same channel as their 'root' AP). With SSID broadcast disabled, roaming did not work. With SSID broadcast enabled, roaming worked just fine.

Perhaps I've put it too strongly - it did not work at all well with a 'hidden' SSID. It most certainly wasn't seamless.

I have also observed the same effect on larger scale business networks. So what effect am I seeing? And am I also misinterpreting the performance issues in what Bob Moskowitz has to say here:
http://www.icsalabs.com/WLAN/wp_ssid_hiding.pdf

Kind regards