How to Start Multiple TWS Sessions on a Mac

Background:

By default macOS does not allow the user to run multiple sessions of the same application. The following workaround can overcome this limitation in case you need to run the Trader Workstation for more than one user.

The procedure above presumes that the TWS executable is located in the following path: users/yourusername/home/Applications/Trader Workstation/Trader Workstation.app

If at the time you installed the TWS, you selected to install it for all the users of your system, then the TWS executable will be located here:

/Applications/Trader Workstation/Trader Workstation.app

and therefore you would need to issue the following commands in the Terminal:

cd /Applications

open -n Trader\ Workstation.app