Plugin: Simple Ajax Group Chat - one Chat per site

• More Info: https://wordpress.org/plugins/simple-ajax-chat/
• Install via WP add new Plugins: "Simple Ajax Chat"
• add chat to sidebar OR overlay with this shortcode ONCE per webinar 

CSS to style nicely:

Pro/Cons:

• Contra: Plugin only provides one chat channel!
• Contra/Pro: Plugin on some themes takes the style from theme and you need to style with CSS or happy to see your colors and style used.

d) Pro: Plugin use the name of the registered attendee

Auto clean messages code: https://wp-mix.com/simple-ajax-chat-auto-clear-chats/

Add code via this plugin to the functions.php

https://wordpress.org/plugins/my-custom-functions/