@jeffalo yes you can connect to NodeBB more directly and use session-sharing instead.
Groups: What are they used for?
Solved
General Discussion
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Please forgive the newbie question but what are groups used for aside from listing a collection of users?
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Groups are also used to give permissions that only a select people can have, for example you can set up a group called Moderators and assign then the moderation tag on your category's. Groups can also be used to create hidden category's or category's that people cannot create or post new topics into them.
The permissions for the groups are in your category creation.