A customizable cache discard policy is provided which reduces adverse consequences of conventional discard policies. A detachably latching device may be used to detachably latch the bracket and thus the trailing arms to the front column at the working position. Metadata that is generated establishes a mapping of interface parameters to the routine parameters of the called routine. The rear housing pivotally coupled to the front housing, the rear housing including a latch for securing the computer between the front housing and the rear housing, a battery receptacle for receiving a battery, an electrical interface for electrical communication with the computer, an electrical input, and a controller.