Guardian Procedure Calls Reference Manual

Condition Code Settings
indicates that name-id is out of bounds or that an I/O error occurred with the
$SYSTEM.SYSTEM.USERID file.
= (CCE)
indicates that the designated user ID returned.> (CCG)
indicates that the specified user ID is undefined.< (CCL)
USERNAMETOUSERID Procedure (Superseded by USER_GETINFO_ Procedure) 1479