Various embodiments of the present invention are directed to a method for manipulating a plurality of discrete units of information in a hardwaresoftware interface system for a computer system, said method comprising interconnecting said Items with a plurality of Relationships and managing said Relationships at the hardwaresoftware interface system level. For example, techniques and tools are described that allow quickly switching between operating systems in video disc players that support different media types while reducing wait time and mitigating possible negative impacts to user experience. Prior to mounting of the lifting lug, the tension ring has an outer diameter that is less than the diameter of the tension ring lifting assembly after mounting of the lifting lug to the tension ring. The system responds to a request for network configuration information that is applicable to any future time from any external resquester, and searches the trees including the directory entries that reside in the current map tree and temporary map tree. The idler roller has a toroidally shaped outer surface biased against the driven roller. Upper electrode layers 28 are placed on the surface of the upper interlayer insulating film 26.