TruClient functions – How to use documented functions shown in Help ? ? ?

How do I use the TruClient Functions such TC.advanceParam
(parameter) ?
Clicking help (?) in TruClient opens TruClient protocol so selecting Function Reference and then TruClient Functions I see many available Functions but it does not really tell me how to use them…is there a Function library I can import, do I have to create it myself? Why show all this in Function Reference if they don’t simply exist for use
Can some provide steps to use or create or point me to the document that does?

Thanks