A real-time streaming media playing method is provided. Each interaction with each application and a switch are monitored and time stamped. A user interface supports a user’s selection of one of the output destinations for any sheet of a print job in at least one of the input sources prior to the printing. The APP may be full-length or a fragment capable of being proteolytically cleaved by -secretase. Impurity gas discharge control discharges an anode off gas out of the fuel cell stack, in response to detection of a decrease in hydrogen concentration to or below a preset reference level by the hydrogen concentration sensor. Channel interpolation can compute a pseudo channel estimate for a sub-channel known to have a spur location can be computed by interpolating the channel estimates of adjacent good sub-channels.