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Delphi-Quellcode:

{
 Connect a handler to the Application.OnMessage event.
 You have to do this in code:
}

  private
    procedure AppOnMessage(var Msg: TMsg; var Handled: Boolean);
    { Private declarations }
  public
    { Public declarations }
  end;
  
var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  FConnected: Boolean;

procedure TForm1.AppOnMessage(var Msg: TMsg; var Handled: Boolean);
begin
  if FConnected then
    case Msg.Message of
      WM_KEYFIRST..WM_KEYLAST,     // Keyboard events
      WM_MOUSEFIRST..WM_MOUSELAST: // Mouse events
        Handled := True
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnMessage := AppOnMessage;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Application.OnMessage := nil;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FConnected := True;
end;