This option is to enable you to load previously saved or remote data sets into the main graph, list view, the averages graph & Display CSV. This is so you can view your previous/remote graphs, take shots of them and view the data in them.
Basically if you want to have a quick look at your speeds etc from months ago and take a screen shot of the data (graph). Handy if you want to compare your connection stats between some time ago and now.
The data set will return to the "Working" data set automatically if a test is started or you send JDast to the tray, but you can set it back to the "working" data set manually in the same pull-down menu under "View Other Data Sets / Return to current data set".
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