Windows Messages are used by the Microsoft Windows notification system. By sending Windows Messages, the MAXScript developer can participate in the Windows notification system and access features not directly available in MAXScript.
Windows.sendMessage <int HWND> <int message> <int messageParameter1> <int messageParameter2>
Calls the Window’s SendMessage function passing the argument values.
For an example, see How To ... Develop a Selected Objects Inspector using ListView ActiveX Control - Part Two
See also
ActiveX Controls in MAXScript Rollouts