Library /sys$common/syshlp/mailhelp.hlb DIRECTORY, Qualifiers, /EDIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Invokes a text editor using the output of the DIRECTORY command
    as input to the editor. Unless you have selected a different
    editor, the DECTPU-based EVE editor is invoked. The /EDIT
    qualifier enables you to find messages by scrolling through
    folders or searching text.