Abstract: Methods and apparatus, including computer program products, implementing and using techniques for customizing a graphical function display. In one aspect, the invention features operations to customize a toolbar graphically representing tools including one or more groups of tools. A tool is represented by an icon on the toolbar, and a group of tools is represented by one or more icons on the toolbar. In response to user input, an icon representing a group of tools can be replaced with all or a subset of icons representing tools in the group of tools. Similarly, in response to user input, a plurality of icons representing tools in a group of tools can be replaced with an icon representing the group of tools and can also represent a tool in the group of tools.

Abstract: An emergency lighting system has emergency light units operable by DC power and connected to a source of AC and DC power by the same conduit system. Power to the conduit system may be switched from AC to DC in the event of a power failure and a load relay module in the conduit system adjacent the light units senses the change to DC current and switches from an Ac load output to a DC load output to supply DC power to the emergency light units. The system will generally include both exit signs operable by both AC and DC power and emergency light units operable only by DC power.