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+name snapshot
+category Package
+shortdesc List the external dependencies of a LaTeX document.
+longdesc The snapshot package helps the owner of a LaTeX document obtain a
+longdesc list of the external dependencies of the document, in a form that
+longdesc can be embedded at the top of the document. It provides a snapshot
+longdesc of the current processing context of the document, insofar as it
+longdesc can be determined from inside LaTeX. If a document contains such
+longdesc a dependency list, then it becomes possible to arrange that the
+longdesc document be processed always with the same versions of everything,
+longdesc in order to ensure the same output. This could be useful for
+longdesc someone wanting to keep a LaTeX document on hand and consistently
+longdesc reproduce an identical DVI file from it, on the fly; or for
+longdesc someone wanting to shield a document during the final stages of
+longdesc its production cycle from unexpected side effects of routine
+longdesc upgrades to the TeX system. [description copied from TeX
+longdesc Catalogue]