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How all the activities that are running run in main thread?

All the applications that are running or can be accessed runs in main thread of user interface by default. The modification can be done to make it run differently or to make it run or not at all. The exception also comes defining that the code handles the IPC calls that are coming from other processes. The system used to maintain separate pools for all the processes and threads. One pool consists of the transaction threads that are in each process to dispatch all the incoming calls. It also allows the interpersonal calls to be handled in a specialized manner. This allows the creation of separate threads that is used for long-running code, and to avoid blocking of the main user interface threads. The services that run can be killed by the system if it is going out of memory. The system restart the service and implement onStartCommand() to bring the activities back in the memory pool?