Offline Editing/Dongle on Mac

I was able to connect my Macbook to the Ion successfully, but it came up in Mirror mode. If I want to edit the console settings from either the console or the laptop at the same time live, can I do that? Do I need to have a dongle to do so? 

If not, can I export my console show file to my laptop, edit it offline without a dongle, then import it back into the console? I would like to be able to setup magic sheets at home, etc.

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