'FUNZIONI PER CONFINARE IL MOUSE IN UNA DETERMINATA AREA ... usa librerie(DLL) esterne
    Declare Function ClipCursor Lib "user32" (ByRef lpRect As Rectangle) As Integer
    Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Integer, ByRef lpRect As Rectangle) As Integer
    Declare Function GetDesktopWindow Lib "user32" () As Integer
    Dim ZonaConfineMouse As Rectangle 'Ogetto che imposta un area dove CONFINARE il mouse