Just go to the upper menu and click “Window”>”New Window”.
Then you’ll have two instances of one document opened in separate windows.
You could make a (temporary) copy of the PDF in question, with a different name, and then open them both in Adobe Reader.
In Reader 20145.010.20060 you can simple drag and drop from the tab in the Reader window and another window will appear
Yeah, you can do this with Adobe Acrobat, but sadly, not Reader. I’d go ahead and download Foxit anyways. Or CutePDF.
I’m using Ubuntu Linux 13.04.
Open a new copy or Ctrl+N opens a new instance of the same PDF file. This is helpful when you are answering chapter end Q&A so you don’t have to go back and forth.
Start the second Acrobat Reader instance, then in the second instance open the same document using menu “File”.
To start the second instance make a copy of Acrobat Reader shortcut, open properties of copied shortcut, choose “Shortcut” tab and add ” /n” at the end of Target field. For example, if original Target field value is:
"C:\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe"
modified value must be:
"C:\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe" /n
Every time modified shortcut is started a new independent Acrobat Reader instance is created.
If I want to open a pdf file twice, I usually open a pdf using a pdf reader and then I open the same pdf file using a web-browser (i.e Firefox).