DynamicCoordinates Command

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DynamicCoordinates[ Point A, Number X, Number Y ]
creates a point with coords (X, Y). This point is dependent, but can be moved. Whenever you try to move the new point to coordinates (x,y), point A is moved there and coordinates for the new point are calculated. Works best if point A is not visible. At least one of X and Y should depend on A.
Example: {{{1}}}
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