Running the 4D and 4D server applications are available in the v15 R releases for 64 bit on the Mac. But how can you determine if the application is 32 bit or 64 bit? A quick way to determine this is by taking a look at the "Get Info" information of an application. If the 4D application can disable "App Nap", then it is a 32-bit application. Otherwise, it is 64-bit as shown in green below: