The  FILEDEF  command  allows  you  to  specify  filename
information  for  use  by  FORTRAN  programs at the MCR level.
This means that it allows you to write programs  that  do  not
require  OPEN statements or code to prompt you for the name of
files to be used by the program.  The FILEDEF  command  (which
may  be abbreviated to FIL) is used to specify input or output
file specifications before you run your program.  It may  also
be  used  to  delete  one  or  all  of your assignments, or to
provide a list  of  them.   Once  specified,  the  information
remains  in effect for the duration of the terminal session or
batch job, unless you explicitly change it.

     Type

	HELP FILEDEF ASSIGN	Specifying assignments
	HELP FILEDEF DELETE	Deleting assignments
	HELP FILEDEF LIST	Listing assignments

2 ASSIGN

     The general form of this mode of the FILEDEF command is:

     FILEDEF unit filespec

  where

     1.  "unit" is the logical unit number that will  be  used
         to read from or write to the file.  This should be an
         integer in the range 1 to 20.

     2.  "filespec" is the file specification of the  file  to
         be used for input and/or output.


     The two parameters may be separated from each  other  and
from the command name by one or more spaces or tabs.

2 DELETE

     The FILEDEF command in the form

     FILEDEF unit

  (no file specification) causes the  current  assignment  (if
one  exists)  to  be deleted.  The usual FORTRAN defaults then
apply.  If "unit" is zero (not a normally valid  logical  unit
number),  then  all  current assignments for that terminal are
deleted.  This is done for you by the system when you log off,
or a batch job terminates.

2 LIST

     The FILEDEF command with no parameters, that is,

     FILEDEF

  produces a listing of your current assignments.  The listing
may be cancelled by typing CTRL/O if desired.