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

       /PWDEXPIRED (default)
       /NOPWDEXPIRED

    Specifies the password is valid for only one login. A user must
    change a password immediately after login or be locked out of the
    system. The system warns users of password expiration. A user can
    either specify a new password, with the DCL command SET PASSWORD,
    or wait until expiration and be forced to change. By default, a
    user must change a password when first logging in to an account.
    The default is applied to the account only when the password is
    being modified.