Multiple WiFi adapters

A while back there was a discussion of how Windows chooses which
network connection to use when there is both a wired and wireless
connection:
(http://groups.google.com/group/alt.i...de116db990c9be)

Does that same discussion apply to multiple wireless connections?
I.e., if my laptop's internal WiFi adapter and my USB-connected
WiFi adapter are both connected to the same NAP, is the "least
expensive" connection still used?

Does each connection automatically get a different Metric value?

Can those values be manually assigned?

Is there any down side to having both connections active?

Thanks.

--
Dave