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	This is a list of helpful hints and tips to aid in overcoming
the problems inherit in debugging a print symbiont.
	To do this you need at least two terminals.  One to start the 
symbiont on and one to use the debugger on.  It helps to use a third
terminal as the symbiont output device.  That way you can see your 
output as it happens.

 1) You MUST be logged in on an account with the UIC of [1,4].  Nothing
	else will work.
 2) Give your process all the privs known to man.
 3) Set terminal (the one with the [1,4] UIC) up as an operators console
	so that error messages come to you (REPLY/ENABLE).
 4) Do the following to get your symbiont up in debug:

	a) define/group		DBG$INIT   debug_command_file (see below)
	b) define/group 	DBG$INPUT  debug_terminal
	c) define/group 	DBG$OUTPUT debug_terminal
	d) init/que/proc=your_symbiont/on=some_device/terminal  queue_name
	e) start/queue  queue_name

	If you get an error message things get complicated.  You should
	execute the following commands:

		$ stop/reset/queue   queue_name
		$ delete/queue	     queue_name
		$ stop/queue/manager

		Kill the job controller (process JOB_CONTROL) using
			$stop/id= or some other method.

		$ @sys$system:startup jobctl	! Restart the job controller
		$ start/queue/manager/new	! Start the queue manager
						!   you need CMKRNL for this

		Do a SHOW SYSTEM and look for more than one symbiont or
			processes with no names.  There should be only
			one symbiont running...YOURS (SYMBIONT_0001).
			If there is more than one symbiont or processes
			without names...delete them all and do the above
			again.

		Go back and do step 4 again.

 5) After you start the queue the debug terminal will come up with the
	debug prompt (assuming you are compiled and linked w/ debug).
	Set a breakpoint in you routine and then type GO.  The terminal
	that started the queue will return to DCL.  

 6) Print a file with your symbiont by typing:

	print/head/queue=queue_name  filename.ext

 7) The debug prompt will come up again on the debug terminal.  At this
	point debug the symbiont to your liking.

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FOOTNOTES:

a) Example of debug command file:

			set source
			set break page_header
			go

b) DEC people to talk to in Colorado : Liesl, John, and Doug (In this order).

c) Even though PAGE_HEADER replaces the system code.  It is called
		to start the task.

d) You CANNOT do any FORTRAN I/O in a symbiont because the system
		redefines SYS$INPUT and SYS$OUTPUT.

e) Example of error message when trying to start a user symbiont:

		%%%%%%%%%%% OPCOM  26-JUN-1985  10:44:22.11  %%%%%%%%%%%
		Message from user JOB_CONTROL
		%JBC-E-INVMSG, invalid mailbox message received


f) Don't forget to check SYS$SYSTEM: for many copies of JBCSYSQUE.DAT.  One
	of these is created every time you $START/QUEUE/MANAGER/NEW.


g) Be careful debugging this on a running system (one with other users).
	If you have to delete the job controller to clean up the errors,
	then no one can login...no one can submit jobs to print or batch
	queues.
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