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

 command-line

    Specifies a command line to start a particular editor on your
    system when you use the EDIT command.

    You need not specify a command line if you use /CALLABLE_EDT,
    /CALLABLE_LSEDIT, or /CALLABLE_TPU. If you do not use one of
    these qualifiers, the editor specified in the SET EDITOR command
    line is spawned to a subprocess when you enter the EDIT command.

    You can specify a command line with /CALLABLE_LSEDIT or
    /CALLABLE_TPU but not with /CALLABLE_EDT.