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Sometimes, it's rare, I know, we need multiple instances open of a given application.
MacOS by default will not let you do this but with the following trick you can do this from terminal by using the "open" statement with the "-n" parameter (n = new instance).
For example, we can open TextEdit with the following statement in Terminal (Applications -> Utilities -> Terminal):
open /System/Applications/TextEdit.app
if we want to open another instance of TextEdit, then we can do that with:
open -n /System/Applications/TextEdit.app
