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the task isn't undoable - in fact, there is a perfectly good PKCS #11 "soft token" provider as part of the mozilla project which can be bent into service - but you would be looking at getting a skilled programmer to turn that into a windows service for you that read from the sd card the pkcs #15 store and did the cryptographic operations for you (I am not aware of any such service prewritten, but if anyone has one, I would be more than happy to be corrected). It would probably be faster/easier to write your own gina (there are sample implementations available) that checks the card for a user certificate, verifies it, extracts the user name, and then prompts for the domain password as normal.