A mechanism is provided in a data processing system for on-demand caching in a wide area network separated distributed file system or clustered file system. The service system of the air conditioner can perform service, update or renewal, maintenance and the like of an air conditioner more correctly and exactly and attain speedup thereof. The WCU thus provides a unified UI layer on the top of the existing operating system components for ease of use. The intensity adjusting device makes possible to adjust the intensity of the illuminating light, which is guided to the object region, between a maximum value and a minimum value. , the maximum of the non-slide limit which is required for keeping the rotational driving force outputting members and the rotational driving force receiving members in contact with each other to transfer the rotational driving force. Also provided is a method of bonding two or more substrates comprising bringing such an adhesive composition into contact with both of said two or more substrates.