A computer unit (10) arranged to establish contact between itself and a centralized server (12), in where the computer unit comprises means to establish a networked connection (22) with said server (12), and wake up means in case the computer unit is in an off or sleeping state, and optionally if the computer unit is on. The computer unit (10) comprises or is connected to a mobile unit that is active whether the computer unit is in off, in hibernation or sleeping state, or on state, and in where the mobile unit is adapted to receive a unique request from the server (12), via a mobile telecommunication connection (20), and if the request is identified as genuine, the computer unit (10) is adapted to establish a new and separate networked connection (20; 22) to the server (12).