Talking to Internet Explorer embedded Acrobat Reader via COM

Hi all. I'm developing an Internet Explorer BHO (browser plugin) and was wondering whether it's possibly for me to communicate with Acrobat Reader via COM. I have read through the SDK docs and it's not clear whether this is possible. I'm using unmanaged c++.
I think if this can be done I think I will need to call get_document(IDispatch *p) on the webbrowser control, then using p->QueryInterface(...) to gain access to the Acrobat document. However, to do this I will need to pass in a REFIID to QueryInterface. As such I need to find some documentation on the supported COM interfaces and various IDs I will need to use.
If anyone could point me in the right direction, that would be great.
thanks,
Zoltan!

Thanks for your reply. We are writing a web annotation tool as an Internet Explorer plugin. The web annotation part of it is complete, and now we are looking at being able to make annotations on pdf documents loaded within the browser.
Where can I find information about the limited APIs on the ActiveX control you mentioned? Do you think we should be looking at a different approach?
thanks,
Zoltan

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