another ILI9341 question: how to use touch screen ?

About these object things I'm not clear, I don't understand how this works or what is an object or a pointer (?), it's actually very confusing. Moreover, I just see "UTFT" in my own Sketches but no "_UTFT" - so whatever the reason or the functionality is, "_UTFT->" stays just a "black box expression" to me, but I think I don't have to understand it just in order to change it.

so, 2nd question:
When I start to change the H.K.'s UTFT_Button libs to fit to ILI9341_due libs then I first of all must replace all appearances of
_UTFT->
in H.K.'s source code by
_ILI9341->
by "search and replace" in the Windows editor?

Perhaps both in all .h files and all .cpp files?

is this correct?

(ps,
BTW, I already tried to open the files by the Arduino IDE, but although these libs are used by Arduino I can't edit them by Arduino - till now I used just the Arduino IDE because I don't have to use either 3rd party editors or programming tools to make my hardware work. Nevertheless I will try it by the windows editor for this purpose then.)