[Elecraft] USB "adapter" for K3...

[John Ragle]

Does anyone know the nature of the K3 USB -> COMM adapter sold by 
Elecraft? I cannot find anything in the Elecraft literature about it 
(other than the price, of course). For example:

Does it come with a pre-defined COMM port number?
A settable COMM port number between 1 and 10?
A settable COMM port number which may be anything (e.g. 17 or 25 or...).

How do driver software programs/suites such as DigiPan, FLDIGI, HRDeluxe 
recognize this adapter (if at all)? [Some software will not recognize 
ports above 10, while other programs are more relaxed about such things.]

Can the adapter be used for CAT control?

Any information would be useful.

John Ragle -- W1ZI

P.S. Grumbling about the fact that RS-232 is still being used when long 
obsolete...grumble grumble grumble...USB-2.0 on a chip...etc.