// Disable System beep:
procedure TForm1.Button1Click(Sender: TObject);
begin
SystemParametersInfo(SPI_SETBEEP, 0, nil, SPIF_SENDWININICHANGE);
end;
// Enable System beep:
procedure TForm1.Button2Click(Sender: TObject);
begin
SystemParametersInfo(SPI_SETBEEP, 1, nil, SPIF_SENDWININICHANGE);
end;
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