/sys$common/syshlp/helplib.hlb Lexicals, F$GETENV, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 itmlst

    The defined console environment variable names are:

    Auto_action, Boot_dev, Bootdef_dev, Booted_dev, Boot_file,
    Booted_file, Boot_osflags, Booted_osflags, Boot_reset, Dump_dev,
    Enable_audit, License, Char_set, Language, Tty_dev