When EDT starts up, it reads the installation default startup command
 file.  The name of the file is always EDTSYS.  The default name varies
 depending on the system, as follows:

                    Default Name
                    -----------------
 VAX/VMS            SYS$LIBRARY:.EDT
 RSX-11M & M-PLUS   LB:[1,2].EDT
 RSTS/E             LB:.EDT

 When opening the file, EDT combines the name and the default name
 together into a complete file specification.  On VAX/VMS, therefore, if
 the logical name EDTSYS is defined, EDT will read from it rather than
 from SYS$LIBRARY:EDTSYS.EDT.

 The installation default startup command file should have SET COMMAND
 EDTINI at its end, so that the user's initialization file will be read
 after the installation default initialization file.   If EDTSYS is not
 found, EDT will try again using the name EDTINI, so there is no need for
 an installation-default initialization file that just contains SET
 COMMAND EDTINI.