In the past, using Black's Law Dictionary on WestlawNext has been trying. You look up "constitution" and see a reference to another definition for "penumbra." But you cannot click on "penumbra." You must start a new search.
That problem has been solved. WestlawNext recently added hyperlinks, so you can click through cross-references and find what you need more quickly.
In other WestlawNext news, users can now save files from WestlawNext directly to DropBox. Clicking the download button offers this choice.