VMS Help TCPIP Services, TELNET, TN3270 Keyboard Functions, RESET  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    VT100: KP0                  VT200: KP0
    DEFINE_KEY Function: RESET

    Returns the keyboard to normal input mode from insert mode. Also,
    the RESET function returns the keyboard to your control after
    it locks when you try to enter data in to a protected or a full
    field, or when you try to enter the wrong type of data in to a
    field.

    Invoking RESET turns off the Inhib indicator. The cursor remains
    where it is and the screen remains unchanged.