Christopher,
I've attached a sample of a way to do this. Set up a T/F variable for each of the objects, When the object is clicked, the associated variable is set to True. So each slide will need a trigger for each of the objects to set the variable if the object is clicked.. Also, for each object on each screen, you'll need a separate trigger to change the state of the object to disabled if the T/F variable is set to true.
I left the Visited state on the buttons in my example, so it shows the particular screen on which each object was clicked.