Variable used in Lectora

If you're just talking generic use of "User Defined" variables, then you could use them for several different reasons. One example: Set a user defined variable to determine if a student clicked a button. The variable might look something like, _StudentClick. Under the button, define an action that modifies the variable. OnClick - Modify Variable - _StudentClick - 1 - Set Variable Contents. '1' signifies that the student has clicked the button and '0' indicates that the button has not been clicked.From there...variables have infinite uses.