how to convert window user control to ActiveX

have a windows user control in .NET. How can I convert it to an ActiveX control?
I want to use this control in JSP pages using Javascript. so how can I use this control on JSP pages?

One more problem..

this ActiveX control will open an exe on client side. now, user should not be able to do anything on the web page until this exe is closed. How can I achieve this?

ok, can i open the client side application as child window of the web page(i.e. the client side application will be opened as child window of the instance of the Internet explorer in which the jsp page is opened. how?

thanks in advance