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I'm guessing you are looking at this description: http://mkt.tableau.com/files/Desktop_III_Course_Description.pdf
This topic covers how to use the Edit Tableau Calculation Editor- like adding secondary table calculations ( like you might use here: https://onlinehelp.tableau.com/current/pro/desktop/en-us/help.html#pareto.html?Highlight=pareto ) or locking the scope and direction to specific dimensions.
I think this also covers when you write a table calculation in the Regular calculation editor (like a WINDOW_AVG() ), how you adjust the scope and direction of that manually written calculation (like here Customize Table Calculations )
Does that help answer your question?