A computer architecture allows for simplified exception handling by restarting the program after exceptions at the beginning of idempotent regions, the idempotent regions allowing re-execution without the need for restoring complex state information from checkpoints. The battery charger provides untethered charging either in situ within a battery-powered device or external to the device. This composition imparts to the nanoemulsion an opaque coloration, besides providing to the skin inherent properties of the nanoemulsion such as better absorption of the components by the skin, imparting softness, smoothness and moisturizing for 24 hours, and may be added to products indicated for hair care. In another preferred embodiment, the predetermined pattern in step is preselected from a plurality of predetermined patterns, and the game ends when the preselected pattern is first matched. The apparatus includes two tables movable relative to one another and structure enabling the apparatus to be used with tubs or spas of different sizes and shapes. The applicator can also be configured to deliver other therapeutic substances introduced into the flow of gas.