This info you want is probably somewhere on MSDN. It might be tricky to find. MSDN is littered with the bones of intrepid explorers who collapsed after searching long and hard for specific information. (Hm.. it wasn't that hard to find after all. Start here.)

You can find some skeletal info by firing up the ActiveState ActivePerl documentation page. Scroll down in the left pane, and select Win32::OLE::Browser. This gives you a nifty, web-paged based type browser. In the center panel on the left, scroll down to "Microsoft Internet Controls". This type library defines a class named "InternetExplorer" and one called "WebBrowser". I've only poked at these, but they look like they may give you some of what you want.