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&ZNMSUP

Returns the value of the system user prefix.

The NMSUP system initialization parameter, as specified in the startup JCL.

It is a 1- to 4 -character system user prefix value. If not specified, the NMDID value, if specified, or the first four characters of the primary ACBNAME is used.

This value is used to construct the user IDs of the various background regions, for example, BSYS ( where NMINIT and NMREADY execute) has a user ID of ddddBSYS, where dddd is the NMSUP value.