When LSE is installed, two item names are defined:

     LSEDIT

         Choosing this item will invoke DecWindows LSE.  If a file
         name is selected when this item is chosen, then that file
         is brought into LSE.

     LSEDIT Another File

         If you have a DecWindows LSE running, you may select one or more
         filenames, and then choose this item.  The selected file(s) will
         be "pushed" into the existing LSE.