How do you display PDF files?

>The PDF file seems to be the 'Document' format of the masses!
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>Presently, our Treeview Control can attach a PDF file and subsequently run it when required.
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>Our clients are now marking up their PDF files with 'Markers' / 'Hotspot' etc. They have asked us to provide a link back to the Treeview Node.
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>Example, if the PDF is a layout of a House and they point,(Double Click) to the Kitchen on the PDF, the PDF closes and returns to the Treeview Node showing the 'Kitchen Node'.
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>Whilst we can manipulate the treeview easily with a single return parameter, how do we get Acrobat to return it back to us?
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>Any assistance would be appreciated, as I can see this as a very common function.
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>Our experience on Acrobat is limited, however, we have the feeling that plugins and SDK Toolkits are required, but all we need is a single parameter retrun from the selected hotspot!
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>Daniel