Setting this object to the subscriber name will clear all the sessions associated with the subscriber. In the case of PPP circuit, the PPP state machinery attempts to renegotiate and re-authenticate a new session with the remote peer on the circuit. In the case of RFC 1483 and RFC 1490 encapsulated circuits the circuit is brought down and then back up and an attempt is made to re-authenticate the subscriber bound to the circuit. This object returns a zero-length string when queried.