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

    The SET EDITOR command allows you to determine which editor will
    be invoked, and how it will be invoked, when you issue the EDIT
    command. These editors must be accessible from DCL level. If you
    do not specify an editor with the SET EDITOR command, then the
    EDIT command will invoke the Compaq Language Sensitive Editor.