Documentation

In order to evaluate the program the evaluator needs to know how many of the arguments to the operator have been evaluated, which operator this state applies to, and which child was evaluated last. The arguments (parameters) are necessary since the operators are postfix. The operator pointer is necessary so that the program knows what it is supposed to do, and which node in the network it should modify. And the last child evaluated is neccesary for the conditionals to decide which child to evaluate next.

The reason this information needs to be explicitly stored is so that the nodes can be evaluated in ``parallel'' by executing on instruction of each, saving the state of the evaluation and moving to the next node. Because of the need to change to a different node after each instruction the evaluation can not be done recursively.

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