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When you move an object, its x,y coordinates change. You can move selected objects precisely by changing their x,y coordinates in the Control or Transform panel. Alternatively, double-clicking the Selection tool opens the Move dialog box, where you can specify values numerically (see Figure 1). Clicking the Copy button in the Move dialog box leaves the original shape in place and moves a copy of the object

Source : http://www.adobepress.com/articles/article.asp?p=1248996