Opening more than one storyline file at a time?

Hey all, I feel like this is a really dumb question, but is there a way to open more than one storyline file at the same time? I like when I am doing a series to have the original course open so I can see what kinds of styles I created, and reuse elements out of it. Currently when I try to open the original, while I have the current course up, it closes the current one, which makes me think that there is no ability to open two or more storyline files at a time. 

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