Andreas,

> >   802.11b wireless card gives you 4-6M bits/sec connection.
> 
> This would be about perfect. But is there any such hardware available
> for the iPAQ?! And how does one use it - is it just like any other
> network?

  I have a Cisco AIRONET 340 card and a PC-card expansion
"jacket".  Both should be available at a few hundred dollors
in total.  (You may need to get a 802.11b hub.  This costs a
little more...)

  It is just like that.  Squeak Socket works fine for
wireless network.

-- Yoshiki