The job of the executors is to process messages. Each message has a "point", the most common is "execute", it creates a new node. Other messages impact those living nodes.
When false, the emitting node is not removed from the receiving node's cnodes list. Using by flanking nodes.
As said above an "execute" message creates a new node (unless the "tree" it holds is broken at its root).
{
point: "execute",
exid: "xxx", // execution id
nid: "xxx", // node id
tree: [ "task", { "_0": "stamp" }, [] ],
payload: { color: "blue" }
}