Abstract: This invention provides 6H-[1]benzopyrano[4,3-b]quinoline compounds having the formula I: The invention further provides compositions including the compounds, methods for the use of the compounds, and methods of preparation of the compounds.

Abstract: A cooling system for a high-end server includes four hot-pluggable fans plugged into a fan control board. The fans are arranged in two groups, with each group having two fans, one behind the other. One of the groups of fans is used to cool the processor boards and the other group is used to cool the system I/O board slots. Under normal operation, only one fan from each group is active, while the other fan freewheels, providing redundancy. A fan control board delivers power to each of the fans and further provides a signal, responsive to temperature sensors, to each of the fans to control their speeds. Each of the fans provides a fan fault signal and a fan not present signal to the fan control board. The temperature sensors are placed proximate the processors and I/O components to monitor the operating temperatures thereof, and communicate the respective temperatures back to the fan control board, via I.sup.2 C bus.

Abstract: A computer system or computer server system having redundant devices that are periodically checked in order to determine whether the redundant devices would be operational if the primary devices failed. The primary and redundant devices are in electrical communication with a controller circuit which, in turn, is responsive to a microprocessor and/or the computer's operating system. The primary and redundant devices can be hot-pluggable so that the computer system does not need to be powered down when and if the primary or redundant devices need to be replaced.