Typically, when you create a multi-module course, you add a menu to support a user-driven learning path. When users can study the modules in any order or when a course has many modules, adding a visual clue to indicate user progress helps.
In Captivate 4, you can create a multi-module course that supports a user-driven learning path and also gives a visual clue (a checkmark) when a user completes a module by simply adding a TOC to the movie.
The steps to create a TOC are here.
If you are using a menu to create a multi-module course, check this article by Isaac Tabe. Isaac gives step-by-step instructions to show checkmarks on the menu slide of a multi-module Captivate movie based on user progress. The solution uses variables and advanced actions, a powerful way to add complex interactivity in your Captivate movie.
For more information on variables and advanced actions, see Captivate Help.