I love developing software on my MacBook Air! I got the latest version with the maximum possible specifications (i7, 8GB internal mem, 512GB SSD disk) so it works better than anything I ever had!
One of the things i was missing (a lot) while developing is that I cannot start 2 instances of the same application on a Mac. In Windows I normally have 2 or 3 instances of Visual Studio open so I can work on several projects / solutions at the same time.
This way of working is not as easy on a Mac as it is in Windows. If you want to do this you should use the terminal command open using the -n switch. The description of the -n switch for the open command is
open -n Open a new instance of the application(s) even if one is already running.
Now every time opening a terminal window and typing this command is a bit irritating but for this you can use the Automator application that comes with the Mac OSx operating system.
First you need to create a new document in Automator and choose Application as the type of document:
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Then choose as Action, Run shell Script. After that you enter the open -n command as the script command, with the Xamarin Studio application as the application that you want to start. So this would be:
open -n “/Applications/Xamarin Studio.app”
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Save this document and afterwards double clicking on it will open another instance of Xamarin Studio!
Easy, once you know how to do this!
Running multiple instances of Xamarin Studio on a Mac
原文：http://www.cnblogs.com/zjoch/p/4672797.html