History

PDF Reader for Windows 7 saves a list of the PDF files you have recently opened, if you enable the History feature in Options->show recent read items. The maximum number of PDF files in the history is 10.

Hot keys to open the PDF files are,

Ctrl+1 - Open the PDF file on top of the History list

Ctrl+2 - Open the second PDF file in the History list

Ctrl+3 - Open the third PDF file in the History list

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Ctrl+10 - Open the PDF file on the bottom of the History list