When we fire an event on the client, let’s see what’s actually happening behind the scene.

• Once a client emit an event first it will reach the checkpoint no 1.
• It will make sure this event and the client can proceed
• After event pass through the checkpoint it will go through a set of filters
• Filters can add/modify and delete the content of the event
• Then it goes through the next checkpoint to see which clients can receive this event
• After it passed through the checkpoint 2, event will be delivered to the respective clients

You might wonder, although I have talked here about checkpoints, but I never used any checkpoints in the example. It is because of the insecure package. If insecure package exists, all the checkpoints are open by default or otherwise closed.