Abstract: A computerized power management control system (10) includes a virtual modular relay device (82) for providing input and output data to and from a corresponding, actual modular relay device (47 or 49). Virtual modular relay device (82) is displayed in a window (90), with the upper left-hand corner of window (90) including a graphical depiction (92) of the modular relay device. Immediately below the graphical depiction (92) is a communications status indicator (94), which shows the status of communications (connected/disconnected) between the virtual device (82) and an inter-process communications server (52). Various fields (96) appear along the left-hand side of window to identify the modular relay unit (47 or 49). Below identification fields (96) are a plurality of buttons (98), each of which allow the user to activate a program module. Buttons (156 and 154) can be customized by the user to activate any program module.