using a second screen with your macbook? POSSIBLE?

ill o.g.
Say if I use a second 19 or 20' screen with my macbook will I be able to have my sequencer screen for logic on the second screen? or would it not detach? cause im lookin to get a macbook not the pro and just use logic and pro tools on it. But is it even possible to make my laptop like a second screen even though its my main source?
 
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