According to IEZCIB, STOP is x'40', MODIFY is x'44' and START is x'04':

CIBVERB  DS    C -      COMMAND VERB CODE                              
CIBSTART EQU   X'04' -  COMMAND CODE FOR START                         
CIBSTCOM EQU   X'08' -  COMMAND CODE FOR STC COMMUNICATION     @G860P2G
CIBMODFY EQU   X'44' -  COMMAND CODE FOR MODIFY                        
CIBSTOP  EQU   X'40' -  COMMAND CODE FOR STOP                          
CIBMOUNT EQU   X'0C' -  COMMAND CODE FOR MOUNT


I'm still left with my original question - especially now that we've determined 
that the STOP/P command existed when I was in high school...  my current 
thinking:

1. Whoever wrote the started task thought they needed to use some sort of 
subsystem request (for whatever reason) and therefore had to have a program to 
make such request
2.  The people who actually wrote this code are no longer with us, or no longer 
on IBM-MAIN at least, so we don't have them around to explain it  

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