Combination of a Master-Dialog System and at least one Slave-Dialog System for implementing instructions of a user, with the Master-Dialog System being equipped with - an input module, into which the user can enter instructions in natural language, - an interpretation module, which interprets the instructions of the user and generates feedbacks in response to these instructions, - an output module, from which these feedbacks can be issued to the user, and - a communications module, which is coupled with the interpretation module and which communicates with at least one Slave-Dialog System (24, 26, 28), in order to implement user instructions, with this at least one Slave-Dialog System (24, 26, 28) being equipped with - an input module (42, 52, 62), into which a user can enter instructions in natural language, - an interpretation module (43, 53, 63), which interprets the instructions of the user and which generates the feedbacks in response to the instructions and - an output module (44, 54, 64), from which these feedbacks can be issued to the user, with the input module and the output module of the Master-Dialog Systems being designed in such a way to enable the communication with a terminal device of the user by means of a first program, with which the user can also communicate with other users (18, 20), this being characterized in that the Master-Dialog System has been designed to be able to communicate via different addresses with user terminal devices, with a functionality of the Master-Dialog System's interpretation module being dependent on the address used. - an input module, into which the user can enter instructions in natural language, - an interpretation module, which interprets the instructions of the user and generates feedbacks in response to these instructions, - an output module, from which these feedbacks can be issued to the user, and - a communications module, which is coupled with the interpretation module and which communicates with at least one Slave-Dialog System (24, 26, 28), in order to implement user instructions, with this at least one Slave-Dialog System (24, 26, 28) being equipped with - an input module (42, 52, 62), into which a user can enter instructions in natural language, - an interpretation module (43, 53, 63), which interprets the instructions of the user and which generates the feedbacks in response to the instructions and - an output module (44, 54, 64), from which these feedbacks can be issued to the user, - an input module (42, 52, 62), into which a user can enter instructions in natural language, - an interpretation module (43, 53, 63), which interprets the instructions of the user and which generates the feedbacks in response to the instructions and - an output module (44, 54, 64), from which these feedbacks can be issued to the user, with the input module and the output module of the Master-Dialog Systems being designed in such a way to enable the communication with a terminal device of the user by means of a first program, with which the user can also communicate with other users (18, 20), this being characterized in that the Master-Dialog System has been designed to be able to communicate via different addresses with user terminal devices, with a functionality of the Master-Dialog System's interpretation module being dependent on the address used.