LMS and communicating completion variable


I have a course with 6 modules (sections) in it.  When the user completes a module a checkmark appears next to the title of that module.  This works fine while the user is in the course. However, if they leave and come back there is no way for the course to know that he/she has already completed that module (set the variable). 

Is there a way to communicate with the LMS that the user has completed that module so that when they return it will already be marked?

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