Go back one. Companies must have a sales office in the United States.
Membership is free.
Yes, you may. The discount granted to members under the Interface Program is in lieu of any other. No dollar value for products purchased under this membership will be credited to any other agreement with Hewlett-Packard. Loaner equipment is available on a first come first served basis to assist companies in developing device drivers. A member may receive an extension to the loan agreement if the equipment is urgently needed to complete the driver development project.