Provide a complete example code with all features

[V1pr]

I really love your idea's, but it's pretty hard to get hold of it. Maybe a commented example program(s) will do some good, providing answers to the following questions:

• what's the differenct between Task/CallbackTask
• passing data from parent to task
• working with workers
• getting results from child
• using expires
• interacting with childs
• what will happen if I pass input towards ProcessCallbackTask ( $x = new ProecessCallbackTask(function($in){ ... })