Fuel-water emulsions in which an alkoxylated, preferably an ethoxylated, polyisobutene is used as an emulsifier are described. An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communication device. The local print provider of the Windows\u2122 operating system has a port monitor which transmits the print data to the printing system over the network using a secure transmission protocol in which the transmitted data is encrypted.