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I would also add to this that in order to open two instances of an app the app explicitly needs to support this. For example, you can't open 2 instances of Calculator.app side by side.

This is really annoying.

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Yeah, I always want 2 calculator apps when I'm speed calculating... what?

You may want to see the result of one calculation while doing another calculation?

If only I could write it down in a text note and refer to it and many more, as opposed to keeping a calculator window open per prior calculation I want to refer to...

Or if only there was a tool like Soulver or Calca...

Yes you can write down the result of calculations and all relevant state and then clear the state of the calculator window before doing a new calculation. But why?

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