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Augmented reality is a technique to integrate the virtual (i.e., computer-generated) information with objects in the real world. Real world objects can thus be augmented in their properties and functions with the help of a computer. One of the authors has proposed an augmented reality system in which a transparent display is used as a means of integration of the real world and the virtual world. This paper discusses an extension of the system so that it can be used in a collaborative working environment. Capturing the gesture as a means of user interaction is realized by a single camera, aiming at simplifying the system setup and image analysis. We propose an idea of utilizing statistical data of human body and human's perceptional characteristics, as well as vision techniques. Two applications are presented to explain the usefulness of the system: one is a game-like application, which we call mind-to-mind communication, and the other a messenger object.