On OpenVMS operating systems, the EDT editor can be called from
    a program written in any language that generates calls using the
    OpenVMS Calling Standard.

    You can set up your call to EDT so the program handles all the
    editing work, or you can make EDT run interactively so you can
    edit a file while the program is running.

  Additional Information (explode) :

• EDT$EDIT
• FILEIO
• WORKIO
• XLATE