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The exec request ( p , h ) event makes the machine evaluate the process p and, when that is interrupted, the handler h. Hence, h corresponds to an interrupt handler and p corresponds to a less privileged process. The handler h has full control over the machine in that it receives all input, generates all output, and cannot be interrupted.
Potentially, one can implement an operating system as a Logiweb machine. In that case, the handler is the interrupt handler of the operating system which runs with interrupts disabled and the process p must take care of all other processing, including user processes, operating system processes, driver processes, and the interruptible parts of interrupt handlers.
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