Acrobat 9 changes to plug-ins

As I have got response from Adobe forum that AcroPDF.dll was revamped with Acrobat 9 to work in a different method (multiple instances vs. a single global one). 
Can anybody explain when user opens a PDF file within IE (Internet explorer) how AcroPDF.dll behaves?
Thanks,
Twinkle
 

I am interested to understand how plug-ins get loaded in context of Internet explorer. I mean if you open two seperate instances of IE and open PDF files within these two IE instance the single AcrobatPDF.dll handling the plug-in references or different?
This is because I am facing one behavior, we have developed one toolbar using Acrobat SDK where we are using PIHandshake and IAC to call acrobat API's to perform the action. Our custom ActiveX control load within IE to load PDF and because acrobat.exe loaded the Plugin also loaded automatically (because it resides under C:\Program Files\Adobe\Acrobat\plug-ins\..) and user can work with that plug-in. But the strange behavior is if user open another PDF in other instance of IE at the same time (while keep running our web application) and come back to our web applicatio and load another PDF document the plug-in is not loading again, i.e never , unless and untill user logoff and login which in turn load Acrobat.exe again.

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