Hello Wolfgang and Luigi,

My example lines are too small to fully understand the purpose of using the gobbleinput instruction :

I have made some slides for my students that I can choose or not ton include in the final presentation :

\skipSlide

\startSlide

bla bla bla

\startyping

language C code

\stoptyping

bla bla bla

\stopSlide

I've made some macros to include or not a slide according to its number given into a list or by just putting before the macro \skipSlide.

This is very useful as I have students of different levels.

The gobbleinput solution is the best solution : I can activate or not a slide according to my audience.

If I use the buffer solution, I'll not be able to deactivate the whole slide containing the typing region.