An absorber for a pipe or sewer structure has at least one feed connection and at least one return connection. The apparatus also has a half H-bridge having a third motor contact on a third side, wherein the shared first side of the first H-bridge and the third side of the half H-bridge may be operated as a second H-bridge. A player device is provided to the player. The identifying manager device can be configured to identify the activated network node. The method may comprise checking validity status of a first license that comprises allowable usage information of a user device; and disabling use of the user device based on the validity status to control payment for the user device.