First of all thanks for answering!
Indeed, that's really not the answer I hoped for.
And circular connections don't really help me.
Here's the situation:
I do have at least 4 NXTs driving in a labyrinth, that shall communicate with a single and central PC that coordinates their activities. So every NXT has a single incoming connection initiated from the PC.
But one of the NXTs shall have two incoming connections: one from the PC and another one from a mobile device like a notebook or mobile phone, etc.
Did I understand you correctly that it's a hardware limitation and not a problem that can be fixed by a new firmware revision?