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Before Windows 8, opening multiple PDFs would result in a window for each one, and you could then alt+tab between open documents.
In Windows 8, they all open to the Reader app, but only one instance is ever open. Is there a way to quickly switch between open documents using Reader?
1The best way would be to just change the program set to open PDF files. – Ramhound – 2013-01-24T20:51:53.007