1. A system for identifying a selected user from a first plurality of users, the system comprising: a first grammar extractor having a first input operatively coupled to receive an identifier of one of the plurality of users, and a second input operatively coupled to receive a first utterance from the one of the first plurality of users uttered during a first session, the first grammar extractor for extracting a first grammar from the first utterance received at the first grammar extractor first input and for providing at an output the first grammar and the corresponding identifier received at the first input; a grammar storage having an input/output coupled to the first grammar extractor output, for receiving the first grammar and identifier for each of the plurality of users and storing the grammar responsive to the identifier, and for providing at the input/output one of said grammars corresponding to an identifier responsive to receipt of said identifier at the grammar storage input/output; a second grammar extractor having an input operatively coupled to receive a second utterance from the selected user uttered during a second session different from the first session, the second grammar extractor for extracting and providing at an output a second grammar responsive to the second utterance received at the second grammar extractor input; and a first recognizer having a first input coupled to the grammar storage input/output, and a second input-coupled to the second grammar extractor output, the first recognizer for identifying a match between a set of a plurality of the first grammars stored in the grammar storage and the second grammar received at the second first recognizer input, and for providing at an output coupled to an apparatus output, the identifier of the user corresponding to the grammar in the grammar storage most closely matching the grammar received at the first second input.