# Mouse coordinate tracking There is a mechanicsm of mouse coordinate tracking within the client. This records the `(x, y)` coordinates of the mouse, and sends them back to the server each tick. When the client connects with the server, after it receives the player privilege, it receives a byte denoting whether or not the client should send these coordinates to the server periodically. ## Packet structure ``` byte opcode = 45; byte dummy = 0; byte[] mouse_data; ```