Hello, to call an application's function out of a html page, you should use the the external object provided in JavaScript. To be able to react on the fuction call, you've to implement the IDispatch interface in your application, there handling GetExternal(). This function is called whenever a call to external is done inside a web page. To get more information, you should search MSDN for "webbrowser customization" or chtmlview and IDispatch.