Invokes the SUMSLP batch-oriented editor to update source files.
   You enter text changes and editing commands in update files.  SUMSLP
   merges the update files containing the changes with the source file
   that you specify, and gives you a record of the changes in the form
   of an audit trail.

   For more information, see the VMS SUMSLP Utility Manual.

   Format:

   EDIT/SUM  file-spec