To handle emergency situations that could arise, such as if RACF® becomes inoperative or all SPECIAL users become revoked, you should consider setting up at least one, and preferably two, "emergency" user IDs. These user IDs should never be used except in extreme cases, under management supervision. They should have no TSO segment in their RACF user profiles, and their entries in the SYS1.UADS data set should give them all attributes.