The Cancel Input Request routine immediately cancels any read-
    in-progress that was issued by SMG$READ_COMPOSED_LINE, SMG$READ_
    KEYSTROKE, SMG$READ_STRING, or SMG$READ_VERIFY.

    Format

      SMG$CANCEL_INPUT  keyboard-id

1 - Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2 - Argument

 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.