Hi Bob. I mentioned this in another post a while back. I have programmed 10 PICs at once for use in commercial products BUT the products were tested before releasing them. Simply stack one PIC on top of each other so that all the pins are in parallel and all will program. If you stack say 6 and the 4th one up isn't connected then the chain is broken and 4,5 and 6 won't be programmed. Try it, it works.