Methods and systems for providing fast handoff in WLAN-like communications system construct a caching candidate set based upon a weighted handoff tendency coefficient. A cold spray system including the portable gas heater and a method of heating gas are also disclosed. A servo-valve behind the accumulation piston controls the mobility of the accumulation piston via a fluid control chamber. Because the location of each dimple is predetermined, a tracking assembly can use the dimple locations for tracking purposes. The clips will be made so that you can glide the box along the rim of the tub.