When an address space is created, the first tcb is handcrafted into the address space to kick start the processing required later. The first tcb is RCT (region control task) which initialixe the address space and prepare the address space for swap out and swap in. It will attached the dump task used to dump the address space. It will then start the STC (started task control) task which analyze the command used to start this address space (START, MOUNT, LOGIN) and start the next task accordingly.
In case of START INIT command (batch), STC will start the initiator task which will start the job step task.
LOGIN will start the TMP (terminal monitor program) and MOUNT will start the mount processor instead.
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