It is an object to provide an acrylic resin composition dispersed in water. When a user inputs a word, words in the lexicon file are scored against the input word to determine a correct spelling or other spelling variant for the user to select. The gas concentration sensor is responsive to application of voltage to produce a current signal indicative of concentration of the gas. This invention uses the natural redundancy of routes in a mesh and other techniques to increase the reliability of a network, even as the paths to any given node are dynamic in nature. The subscriber apparatus may include roaming capability to control movement of a communication channel of the subscriber apparatus from a first system to a second system. A first tunable reflector section and a second tunable reflector section are integrated on opposed sides of the amplifying section to reflect the optical signal at a clamping wavelength and to change an internal gain level to cause a stimulated emission at the clamping wavelength above the internal gain level.