1. A machine having a computer system for user-guided teaching of deictic references and objects of said deictic references to a conversational system in said machine, said machine comprising: a conversational system installed on said computer system for carrying a dialog with a user, said conversational system including a deictic reference tool for decoding a deictic reference received from a user, wherein said deictic reference comprises of a combination of a physical pointing gesture and a spoken utterance, and wherein said machine executes said deictic reference with respect to one or more objects of said deictic reference decoded; a system bus for communicating data and control signals received from said conversational system to said computer system; a data and control bus for connecting devices and sensors in said machine; a bridge module for connecting said data and control bus to said system bus; one or more respective machine subsystems coupled to said data and control bus connected to said computer system in said machine, said one or more respective machine subsystems having a respective user interface for receiving said deictic reference from a user; a memory coupled to said system bus for storing one or more deictic references and objects of said deictic references learned by said conversational system; and a central processing unit coupled to said system bus for executing said deictic references with respect to said one or more objects of said deictic references learned.