Library /sys$common/syshlp/sysmanhelp.hlb SHUTDOWN, NODE, Qualifiers, /REBOOT_CHECK  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /REBOOT_CHECK
       /NOREBOOT_CHECK (default)

    Checks for basic operating system files and notifies you if any
    are missing. Be sure to replace missing files before rebooting.