If a spool file is opened before a prestart job handles any program start request, the spool file is associated with the prestart job entry user profile; otherwise it is associated with the current program start request user profile.
If the prestart job entry profile and the current program start request user profile are different, spooled files are spooled under a job with the first part of the three-part job name being QPRTJOB and the second part being the name of the user profile.