Is there any good method for preventing someone from opening up the same lesson twice? Either in two seperate tabs / browsers or two separate devices and running the lesson at the same time.
Obviously, you could go the route of putting a variable into the database (1 or a 0) and when they're actively taking the lesson the zero turns to a one, and the lesson cannot be reopened while this variable is a one.
But this is strife with potential errors and loopholes to get around it.
undefined
Is there any other good way developers have come up with?
