VMS Help RTL Routines, SMG$, SMG$CANCEL_INPUT, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 keyboard-id

    OpenVMS usage:identifier
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference

    Specifies the virtual keyboard for which the input is to be
    canceled. The keyboard-id argument is the address of an unsigned
    longword that contains the keyboard identifier.

    The keyboard identifier is returned by SMG$CREATE_VIRTUAL_
    KEYBOARD.