WebBrowser control : need help controlling browser control from within VC++ .NET 2003 program

[max reason]

I added the WebBrowser component to my toolbox,
then placed one on a form with other .NET components.
This much seems to have worked, but I do not understand
how to control the sucker from within my application.

Specifically, what sort of syntax is involved to get the
various interfaces (IHTMLWindow, IHTMLDocument3, etc)
in the internal objects and call functions in them?

What has worked is this:

A: the framework put the following in the form class:
private: AxInterop::SHDo cVw::AxWebBrows er* browser;

B: the framework put the following in the InitializeCompo nent()
part of the form class:
this->browser = new AxInterop::SHDo cVw::AxWebBrows er();
(__try_cast<Sys tem::ComponentM odel::ISupportI nitialize*>(thi s->browser))->BeginInit();
and elsewhere
this->browser->Enabled = true;
this->browser->Location = System::Drawing ::Point(400, 24);
this->browser->OcxState = (__try_cast<Sys tem::Windows::F orms::AxHost::S tate * >(resources->GetObject(S"br owser.OcxState" )));
this->browser->Size = System::Drawing ::Size(360, 176);
this->browser->TabIndex = 3;

including this because I added one event handler:
this->browser->DocumentComple te += new AxInterop::SHDo cVw::DWebBrowse rEvents2_Docume ntCompleteEvent Handler(this,
web_browser_eve nt_document_com plete);
So, here we are in an event handler, and no matter what I try
off the top of my head, it doesn't work. I can call some of
the immediately available methods like the one shown below,
but how to deal with the document variable is what I don't get.
How do I get IHTMLWindow3 and IHTMLDocument3 and such
in order to get at the document and its html-text and such?
And how do I find out what I CAN get, in general? Is there
some way to make the framework show what can be done,
like with normal methods.

Thanks in advance:

private: System::Void web_browser_eve nt_document_com plete (System::Object * sender,
AxInterop::SHDo cVw::DWebBrowse rEvents2_Docume ntCompleteEvent * e) {

System::Object* document = browser->get_Document() ;
int a = 0;
}