Joined: 03 Jul 2007 Posts: 1288 Location: Chennai, India
From the manuals
Purpose: Code the USER parameter to identify to the system the person submitting the job. The userid is used by the Resource Access Control Facility (RACF), the system resources manager (SRM), and other system components.
If the installation contains the feature for propagation of the user and group identification, the USER and PASSWORD parameters are required, and the GROUP parameter is optional on JOB statements only for the following:
Batch jobs submitted through an input stream, such as a card reader, (1) if the job requires access to RACF-protected resources or (2) if the installation requires that all jobs have RACF identification.
Jobs submitted by one RACF-defined user for another user. In this case, the JOB statement must specify the other user's userid and may need a password. The group id is optional.
Jobs that execute at another network node that uses RACF protection.
Otherwise, the USER, PASSWORD, and GROUP parameters can be omitted from JOB statements. RACF uses the userid, password, and default group id of the submitting TSO/E user or job.