Hi,

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In the IDE, in the Solution Explorer, right-click on your project and choose "Add Reference" and click on the Projects tab. All the projects from the existing Solution will be displayed in the ListView. If you want a project from another Solution, simply click the Browse button and go find the .DLL.
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Can't a project be in more than one solution (i.e. you can still reference the proj not the DLL) ?

Regards,
Viv