Unity provides tools to get information about your game at run time. This information is useful for testing your multiplayer game.
When your game is running in the Editor in Play mode, the Network Manager HUD Inspector shows additional information about the state of the network at runtime. This includes:
Active GameObjects on the server which have a Network Identity component
Active GameObjects on the client which have a Network Identity component
Additionally, the Network Manager preview pane (at the bottom of the Inspector window) lists the registered message callback handlers.