Is there anything with similar functionality to Cirond's pocketWinc, http://www.cirond.com/pocketWinc.html, available for the SL-5600? Thank you.
No Directly.
That is there is Kismet which will "sniff" all the WLANs, but it doesn't create a "preferred network" list making it easy for you to connect.
I hope this helps,
Craig...
