Chemiluminescent heteroaryl substituted benzothiazole 1,2-dioxetane compounds capable of producing light energy when decomposed are provided. The method includes comparing a database timestamp with a first cache timestamp responsive to an attempt to access the first cache. In another exemplary embodiment, the transponder system is configured to provide an account number in ISOIEC 7816 magnetic stripe Track1Track 2 format. The strain layer is formed only under at least one of a source region and a drain region of the semiconductor device. The item of information regarding actual thrust is associated with a thrust scale and both are presented superimposed on the environment prevailing in front of the aircraft.