1. On the PC, assuming that you are running 2K or XP, install the aircard, and set up ICS (internet connection sharing) 2. on the mac, connect to the PC via an Ethernet cable. Set the Ethernet port IP address to DHCP. Should work.
Are you wanting to put the aircard into a USB hub and connect the PC and the Mac to it and dial from both of them at the same time? I don't think that will ever happen.
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vz 595u aircard