Launching multiple instances of QGIS (Mac)?

This is not necessarily specific to QGIS but is a question I often get with QGIS users needing to reference two projects at the same time.

open a terminal window and type:

open -n /Applications/QGIS.app

Or for QGIS3, open a terminal window and type:

open -n /Applications/QGIS3.app

this format will work with any application:

open -n /Applications/Application.app

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