RACF user or group

Specify the 1-8 character RACF user or group name, and select either Read or Update authority.  When you are finished, click OK.

For group name, the name must begin with A - Z, #, $ , or @.

For TSO users who are defined to RACF, the user ID cannot exceed seven characters and must begin with A - Z, #, $, or @.

Valid Values:  A - Z, #, $, @, or 0 - 9