In message , Adrian
writes
Tim W gurgled happily, sounding much like they were
saying:

A wifi router is set to a channel and can work fine to one laptop. Add
more machines and they are all in contention on the same channel.

Yes.

Not quite.

A network is set to a channel.
That network shares a maximum theoretical bandwidth - 54mbps or
whatever - between the entire network. Think of an old-style hub,
rather than a switch.

But if you are copying files between two wifi machines via a router, I'd
have expected (based on no knowledge beyond guesswork) that there would
be more overheads. Is wifi really full duplex in this situation?

Copying files between laptops here certainly seems slow, although maybe
that's just another Vista feature.
--
Bill