Library /sys$common/syshlp/dbg$help.hlb DEBUG, SET, EDITOR, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The SET EDITOR command enables you to specify any editor that is
    installed on your system. In general, the command line specified
    as parameter to the SET EDITOR command is spawned and executed in
    a subprocess.

    On VAX processors, if you use EDT, LSEDIT, or DECTPU, you can
    start these editors in a more efficient way. You can specify
    /CALLABLE_EDT, /CALLABLE_LSEDIT, or /CALLABLE_TPU, which causes
    the callable versions of EDT, LSEDIT, and DECTPU, respectively,
    to be invoked by the EDIT command. In the case of LSEDIT and
    DECTPU, you can also specify a command line that is executed by
    the callable editor.

    On Alpha processors, you can use /CALLABLE_EDT or /CALLABLE_TPU,
    but not /CALLABLE_LSEDIT.

    Related commands:

       EDIT
       (SET,SHOW,CANCEL) SOURCE
       SHOW DEFINE