Note:  in order to use the default state of the EDIT command, you
     must have the LSE editor on your system.

     Typing EDIT while in screen mode causes you to begin editing  the
     file  that you were looking at in your source window.  If you use
     the LSE editor, the cursor is positioned at the place your source
     window  was  centered.   You  can optionally override the default
     file and start position by specifying a location in the same  way
     as   you   would  with  the  TYPE  command,  for  example,  "EDIT
     MODNAME\10".

     What EDIT actually does is invoke the editor specified in the SET
     EDITOR command.  The default is to SPAWN the command:

     $ LSEDIT/START_POSITION=(n,1) filespec

     (where "n" is a number corresponding to the central line in  your
     source window).

     See the SET EDITOR command for more details.

     Syntax:

     EDIT [/EXIT] [[module-name\] line-number]

Additional information available:

ParametersQualifiers

     The normal usage is to not specify any parameters.  In this case,
     if you are using the LSE editor, the editing cursor is positioned
     on the same text that is displayed in the debugger source window.

     DBG> EDIT

     You can optionally give a module name and line number, specifying
     a different place that you want to come up in the editor:

     DBG> EDIT modname\line-number

     You can specify the line number by  itself,  in  which  case  the
     module  is  assumed  to  be the same as the one currently in your
     source window.

     DBG> EDIT line-number

Additional information available:

/EXIT/NOEXIT

     /EXIT - specifies that you want to end the debugging session  and
     start  an editing session.  In this case, the debugger performs a
     $EXIT call after leaving the editor.

     /NOEXIT (default) - specifies  that  you  want  to  continue  the
     debugging session after you make your edits.