Here's a handy technique. You can use a terminal command to launch a second instance of the same app. So, for instance, you can have the calculator app running twice. Or, three times. This could help with simple apps that only have one window. But it is dangerous to use for complex apps as the instances will trip over themselves in setting preferences and remembering settings and such. Still, it saved me a few days ago when an app crashed in a weird way and I couldn't save my work.
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