1. A system for controlling a computerized system, the system comprising: means for providing a detection space; means for placing a physical and identifiable member having a semantic meaning independent of the member within the detection space, the semantic meaning being dependent upon an identity of a user who placed the member within the detection space; means for determining the semantic meaning of the member within a given semantic context; and means for controlling a computerized system in response to the semantic meaning of the identifiable number.