Determining which instance of IE is firing event

I have an application which is automating IE 5.0 via the WebBrowser2 interface. My application supports multiple instances of the browser, and can control each one individually.

I have just added an event sink to listen for browser events -- now here's my problem. Can someone tell me if there is a way I can tell WHICH instance of the browser is firing an event? I want to be able to output "Browser 1 finished downloading" not just "A Browser finished downloading".

Any help would be greatly appreciated!

regards;
Bill..
[email protected]