Alert to other user that someone else is logged on an application?
Application Type

Fellows, I'm making a FAQ site. In the site i build a chat, but i want that the button to access the chat became visible only if one of a group of especific users logged in the aplication. The others users (those who wants clarify doubts) doesn´t need login the application. So, i need a way to indicate for the client side not logged that someone on the client side logged in, then using that information on a "if" to show or hide the chat button.


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