A system for preventing accidents in the operation of a monitored apparatus carried by a user has terminal in direct contact with the body of the user and provided with a circuit for continuously or periodically transmitting an authorizing user data signal through the body of the user. The system dynamically assigns a fileset ID to the file that belongs to that fileset. A slide-out room or other enclosure is moveably located in the opening. A probability distribution of the labels is inferred, in which the probability distribution is a conditional random field. Besides, the positioning fingers prevent the MS and MS Duo cards from a false insertion into the memory card adapter in a reverse direction.