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One downside to Hall is that you are unable to edit messages once they have been submitted. It also doesn’t appear to have any in-line code support. Hall is free for the first 1-5 users. If your team has more than five users, the fee starts at $3 per person each month.
RocketTheme Articles /blog/team/109-group-chat-solutions-for-teamsSimply put: If the visitor side of the site is like the Wizard of Oz's grand hall, the administration side makes up the space behind the curtain. Navigating through the backend of your site is easy, once you get used to the quirks of working within Joomla.
Joomla Documentation /docs/joomla/platform/administrator.md