A drive circuit produces a drive signal having a waveform of a predetermined waveform shape for a device having a piezoelectric actuator. In one embodiment, an environment variable manager monitors the data processing system for any change effecting any of the environment variables within the data processing system. The polymeric skin layer can comprise a propylene-butylene copolymer or an ethylene-propylene-butylene terpolymer, with this copolymer or terpolymer containing from about 4 wt % to about 12 wt % of butylene. A gate pattern is formed in the slit-type opening and the trench mask pattern is removed to form a contact opening exposing the active region. The error signal is used to adjust the set of samples that will be used and processed in connection with subsequent symbols. A selected file system call 109 is redirected by sending a file request to a server over a first protocol.