Well it doesn't work exactly as Hugh described, but I think the main
error is that the JOB card should be first of the deck :-) You can also
decide not to put a JOB card at all, in which case it is implicit. But
if you put one, it means that everything before the first JOB card
(and between EOJ and next JOB card) should be discarded. This is useful
if your mailer or gateway inserts trash before the beginning of the
message (like an RFC822 tag moved in the mail body "because this
brain-damaged IBM RSCS violates RFC822"). This trash would be executed as
commands, might cause an "Unknown command" message, and then the
remainder of the job would be flushed.
 
//STUFF DD "BLAH"
 
is valid and equivalent to:
 
//STUFF DD *
BLAH
/*
 
But '//STUFF DD' is a missing argument error.
 
  Eric