The compounds are of the class of pyrido3,2-e1,2,4-tiazolo4,3-apyrazines, useful in the treatment of central nervous system disorders. The solenoid includes a coil member, a pole piece having an inside surface with recessed and non-recessed portions to form an inner recess in the pole piece, an armature inside the pole piece, and a bearing held in the recess between the pole piece and armature, the bearing having an inner surface extending inwardly just beyond the inside surface of the pole piece non-recessed portion. The server activity is monitored by an availability manager to determine an availability status of the server.