How to save a Preview session with multiple pdf files open? I often work with multiple pdf files open in Preview. I would like to save the "session", so that I can go back to that exact set of files and work with them again. Is there a way to do that? 

In most browsers this is standard, but I don't see any way to do it in Preview, or any other pdf viewer. Does it exist?
Go to system preferences -> general, and uncheck "close windows when quitting". Now whichever session you want to preserve, just quit the app with that. When you reopen preview, all those files load too.