We've recently released a new version of the Handle Plug-in for V8.0 
or greater of Adobe Acrobat and Acrobat Reader. It is available at
http://www.handle.net/hs-tools/adobe/
It is intended to demonstrate the utility of embedding a identifying 
handle in a PDF document. This contrasts with the common use of 
handles to provide persistent links from one resource to another. 
Instead, these handles, through use of the plug-in, provide a 
persistent link between a document and up-to-date information about 
that same document, e.g., the existence of a new version.
A set of demonstration documents, each with an embedded identifying 
handle, is packaged with the plug-in to show potential uses. To make 
productive use of this technology, a given industry or community of 
users would have to agree on one or more specific applications and 
populate the relevant handle records accordingly. CNRI would be happy 
to work with any group interested in pursuing this technology.
Regards,
Larry
=========================================
Larry Lannom
Director of Information Management Technology
Corporation for National Research Initiatives (CNRI)
Suite 100, 1895 Preston White Dr, Reston, VA 20191
email:  llannom@cnri.reston.va.us
web: www.cnri.reston.va.us
tel:  703 620 8990
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