A transaction automation and archival system is provided for controlling, real-time logging, and archiving complex commercial transactions such as the purchase and financing of an automobile. An electronic contract disclosure unit or ECDU includes a digitizing video display for imaging the various documents involved in the transaction and a digitizer for allowing participants to sign, indicate choices, and otherwise interact directly on documents and images presented on the display. A computer controls the progress of the transaction, controlling, for example, the order of presentation of documents to a vehicle purchaser, receiving signatures on the displayed documents, offering choices of various packages to the purchaser, and insuring that the transaction is carried out properly. The transaction is logged for future review which may include a video record. One or more fingerprint readers allow participants to select between options while simultaneously verifying the identity of the individual making the selection.