Hello,
Unfortunately DAQmx Base 1.0 does not support using two DAQCards in the same PDA. I am not sure what technical hurdles it would take to support this, but I do know that one reason it has not been implemented yet is because using two PCMCIA cards would surely drain a battery quickly.
I highly encourage you (and anyone else reading this post and agreeing) to submit feedback to R&D that you would like to see this functionality in the future. You can do so by clicking on �Contact NI�, and selecting product feedback in the lower left hand side of the page.
Best regards and good luck with your application,
Justin T.
National Instruments