- zing-worker is a process, see ./examples/00-zing-process ... - but more specifically is a worker process that listens to 1+ queue(s) ... - and invokes the user-defined receive() method when new messages arrive - it's a class which is intended to be subclassed - because a Worker is also a Process, it runs its own event-loop - it invokes the perform() method at every event-loop tick - it invokes the receive() method when a new message is received - as with all other process types, a Worker process can multitask - the process is usually enacted by calling execute() - execute() starts the process event-loop