Limpar o buffer do teclado e mouse

procedure EmptyKeyQueue;
var Msg: TMsg;
begin
while PeekMessage(Msg, 0, WM_KEYFIRST, WM_KEYLAST, PM_REMOVE or PM_NOYIELD) do;
end;

procedure EmptyMouseQueue;
var Msg: TMsg;
begin
while PeekMessage(Msg, 0, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE or PM_NOYIELD) do;
end;