Link objects, such as messages (in an OOM), or references (in a PDM) are drawn between two ordinary objects in the diagram:
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Click a link object creation tool in the Palette and note how the pointer takes on the form of the selected link object.
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Click and hold inside an ordinary object, and then drag the pointer to inside a second object. The link object is created when you release the mouse button. Note that an entry for the link is displayed in the Browser.
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Do the same again to link two other objects or right-click anywhere to release the object creation tool and return to the pointer tool.