A multi-use gaming machine is switchable between playing a game native to the machine and for interactive play of a game taking place at a remote location has a common video display for displaying the results of the game being played by a player at the machine. On the other hand, a cluster classifying portion classifies a plurality of clusters generated in a feature space into any one of a plurality of classes on the basis of the feature value and occurrence frequency of the feature value. Drift of a circuit providing such an inductor current estimation is preferably avoided by adjusting control duty cycle or slew rate of the positive-going ramp portion of the estimated inductor current triangular waveform. A threaded opening is disposed in the recess.