Optical transmitterreceivers for use in a DWDM systems are provided. The subwords are transcribed and chained. A first ejection nozzle can eject the first fluid forward of the cleaning head, and a second ejection nozzle can eject the second fluid rearward of the cleaning head. In this condition, the second stone on the palm side does not come in contact with any part of the hand. The managed resource may include data entities such as data file, data bases, configuration files and source files and other types of resources such as video images, symbiotic relationship configurations and executables.