A spindle has a chuck provided on a distal end thereof for chucking a tool, and a nut screwed to the distal end and rotatable for tightening and loosening the chucking. The memory management mechanism of the present invention reduces journal size, and accordingly, secondary storage utilization by monitoring the effects to the journal by certain transactions and by making one or more adjustments to reduce those effects. When characters are needed to be displayed clearly, one pixel is configured by selecting a stripe arrangement. If a denial of service attack is detected by the home agent, the home agent de-configures the home agent address to which data packets of the denial of service attack are destined. Embodiments of the invention only need to check the responses from the server, instead of having to check to both the responses from the server and the requests from the client, in order to ascertain the boundary between files and to ascertain whether a response from the server is a HEAD response or a GET response. Reference point links logically connecting a subscription profile repository and a service gateway allows the service gateway to receive information about a subscription to a service by a subscriber and forward this subscription information to an external application function that is providing the service to the subscriber through the mobile data network.