The SMB$SEND_TO_JOBCTL routine is used by your symbiont to send
    messages to the job controller. Three types of messages can be
    sent: request-completion messages, task-completion messages, and
    task-status messages.

    Format

      SMB$SEND_TO_JOBCTL  stream [,request] [,accounting]

                          [,checkpoint] [,device_status] [,error]