When incorporating a print server in a wireless LAN, an attached communication environment setting program is installed in a client terminal and executed. The ranging device is configured to receive a ranging echo to facilitate determining a location of a membrane within the propellant tank. ; and an activator C for epoxy resin compositions, wherein activator C is a compound of formula, or is a reaction product between a compound of formula and an isocyanate or an epoxide. The two beams provide information about changes in a first location on one of the reflectors after the first set of passes, and provide information about changes in the first location and changes in a second location on the reflector after the second set of passes. An apparatus for load balancing is also disclosed.