To get the URL for the specific OIS module view you want, log in to the class in a browser and navigate to that view, and copy the URL from the browser's address bar. 

In DropBox, just highlight the text you want to link, click on the "add hyperlink" button (), and then paste in the URL you want.

In Forum, you can do the same thing in the Forum client while editing a topic description.

It works the same way in Calendar, in the description of an appointment, etc.

In Utest, you can put links into questions in much the same way, but one warning -- if you're using the secure browser for the test, you should not link to another OIS module from the test -- it can cause problems.