About IM bind adapter

Dear all
I’m studying the IM driver development ,and use the DDK sample
‘PASSTHRU’. After I intall PASSTHRU , I find that PASSTHRU will bind to each
Adapter, which means if there are two Ethernet cards ,the IM will bind to
each one.
My question is that can I send packets to a specified Ethernet Card in
PASSTHRU ? Example : there are two Ethernet Cards on PC , A and B, Can I
just send packets to Ethenet card A ?
Any suggetstion and clue are welcome .

Best Regards.
Josephxu