Mysql questions max_user_:connections

How does the max_user_connection work? Does it affect online user on a forum?
I have configured in my.cnf this variable but some sites keeps just with the same amount of online users, it doesnt seem to limit visits to a forum. I have set 30, then just 5 for testing, but there are some sites on a server still having 70 or 80 users online.
WEARD?

 

 

 

 

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