Interaction between Node-RED Editor and Runtime

Hi Nick,
hi Node-RED-Developers,

maybe you could help me and share with me some backgrounds of Node-RED. My question is: How is the interaction between the Node-RED-Editor and the Node-RED-Runtime?

As I understood right:
1. In the graphical Node-RED-Editor a program configuration is composed, which is passed to the Node-RED-Runtime in the form of an array of Json objects.

        "id": "926a347b.eed998",
        "type": "inject",
        "z": "dee51ddf.5dbb2",
        "name": "",
        "props": [
                "p": "payload"
                "p": "topic",
                "vt": "str"
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 190,
        "y": 140,
        "wires": [
        "id": "f9e9096a.d22448",
        "type": "debug",
        "z": "dee51ddf.5dbb2",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 350,
        "y": 140,
        "wires": []

2. The runtime goes through the array step by step and registers the corresponding Javascript modules with the appropriate configuration.

module.exports = function(RED) {
    function LowerCaseNode(config) {
        var node = this;
        node.on('input', function(msg) {
            msg.payload = msg.payload.toLowerCase();

3. And then the JSON-parameter "wires" will be used to route the messages.

Where can I find step 2 (the registration) and step 3 (the message-routing) within the node-red core on github?

I think the API for step 2 (the registration) is the following:

Best regards from Germany


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