Wireless Client vs. BS, again

I've got a bit of a conundrum going in my head.

My goal: get a couple of AirPort base stations talking to each other 
(bridging, basically).

I'm told that out-of-the-box, an AirPort (non-Extreme model) base 
station can't talk to another base station. I'm told that in order to 
get these two base stations talking, one has to come out of Base 
Station mode and into Client mode, and only a firmware written for 
such a specific function (ie, KarlNet's products) can help me.

But the thing that's causing my confusion is this: the heart of the 
AirPort base station is basically a Lucent WaveLAN Silver 802.11b 
PCMCIA card. Which can (indeed, it's original purpose is to) 
communicate with a base station.

So what we have is a wireless card, when installed in a base station 
enclosure, can't communicate with another base station. But when it 
is installed in a laptop's PCMCIA card slot, can communicate with a 
base station.

Does this logic seem non-linear to anyone else?

Looking for someone to clear up my confusion. Volunteers?

Thanks,
Dave
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