Given: An existing custom (not a standard device class, if I understand it correctly) 32-bit Windows USB driver written (by others) some years ago. Apparently it was derived from a Microsoft sample. Question: What steps would have to be taken to bring it into the 64-bit world, including dealing with the signing requirement? Thanks, -- Bob Ammerman RAm Systems --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .