On Alpha and Integrity server systems, creates a persona that can
    be assumed using the $PERSONA_ASSUME service.

    Format

      SYS$PERSONA_CREATE  persona ,[usrnam] ,[flags], [usrpro],

                          [itmlst]

    C Prototype

      int sys$persona_create  (unsigned int *persona, void *usrnam,

                              unsigned int flags, unsigned int

                              *usrpro, unsigned int *itmlst);