In .NET 1.1, I have an application which is essentially a web browser, using
the
AxWebBrowser control.

I need to extend the functionality of the control such that a the html/Dhtml
which is being rendered in the browser can call a C# method of the host
application.

I understand that a mechanism for this exists, something described as:
windows.external.

I'd really like some help on doing this in C#, but I have not found any
consice documentation on how to do this.

Any and all help is appreciated.

Specifically, I want to be able to create a web page for this browser which
will, among other things, play a flash based ad, then using some mechanism,
notify the web browser when the ad has completed playing so that the web
browser application can do some other magic.

I'm on the ground floor here with this. I have the web browser application
working, I'm able to detect the completion of the ad, and I have the 'magic'
functionality working. The only thing missing is how to communicate the ad
completion event back to the browser application.

Please don't be shy, all help is appreciated.

NGen introduces instability
Algorithm for multi combination
.NET, Clipboard, and metafiles
Strange problem
Garbage collection and async operations