Abstract: Minimalized energy use and operational cost are provided by the method and apparatus of this invention for liquid distribution system in which pumped liquid is charged to a pneumatically pressurized storage tank, filling it to an optimum level for subsequent distribution of incremental quantities of liquid drawn from the tank, as typical for well water systems of rural residiences. A pneumatic pressure-head of nominally constant mass is maintained in a liquid storage tank during intermittent operations of filling and of discharging liquid from the storage tank, thereby neccesitating minimal venting or charging of air for mainting constancy of pneumatic mass in the tank.

Abstract: A method and computer system for coaching a user how to perform application program tasks is provided. The user activates the coaching program of the present invention while an application program is running on the computer system. If the user needs such assistance, the coaching program helps the user determine the next task the user wishes to perform in the application program. The coaching program then determines if the application program is in the correct state for performance of the next task. If the application program is not in the correct state, the coaching program guides the user through performing essential preliminary tasks that place the application program in the correct state for performance of the next task. The computer system simultaneously displays on the display screen output, such as application program instructions, generated by the coaching program and a user interface display generated by the application program.