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It's basically there for reference. MODX doesn't use it in any way that I'm aware of, but you might want to use it to redirect the user on login or for something else.
I think a register postHook could set it for you when users register.
discuss.answer
If your user belongs to more than one group, this can be used as an indicator of which group should be considered his primary group. Like BobRay said, it would mostly be used in extras, for example to specify which page he should go to when logged in when you have different groups going to different pages on login.
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