This feature allows you to return to the virtual assistant from an external chat embedded in the core window, thus delegating control.
To apply it, the following javascript code 
must be added in the external chat.
function PostMessage () {
var originHost = '';
var source;
function handleMessage (event) {
var data = event.data;
originHost = event.origin;
source = event.source;
if (event.data.message) {
processMessage(event.data.message);
}
}
function processMessage (message) {
if (message === 'postmessage_support') {
var params = {'message' : 'postmessage_supported'};
source.postMessage(params, originHost);
}
}
this.back = function () {
if (source) {
source.postMessage({'message' : 'back_to_agentbot'}, originHost);
return true;
} else {
return false;
}
}
window.addEventListener('message', handleMessage, false);
};
var pm = new PostMessage();
Minified version
function PostMessage(){var a,t="";this.back=function(){return!!a&&(a.postMessage({message:"back_to_agentbot"},t),!0)},window.addEventListener("message",function(s){s.data,t=s.origin,a=s.source,s.data.message&&(e=s.data.message,"postmessage_support"===e&&a.postMessage({message:"postmessage_supported"},t));var e},!1)}var pm = new PostMessage();
Method return: with the PostMessage object correctly initialized, you can execute the method that returns to the virtual assistant as follows .
pm.back()
This code can be used to perform the action after a condition is met, such as logging out of the external chat, either by javascript or in a simple html button.
<button onclick="pm.back()">Back to agentbot</button>
The URL's to which it is derived must be correctly defined with their protocol, HTTP or HTTPS. Also note that if the website is HTTPS, the external chat must also support the same protocol.