User blog comment:Alexgator10/Different Accounts Running at the Same Time/@comment-2233791-20150514141801/@comment-25405452-20150514151615

You just have to launch the app, wait for the splash screen then launch it again. An error will come up saying it doesn't support multiple clients running at the same time, but it won't close any of the windows.

You can actually get more than two at the same time.