Is there any command which allows me to make some blocks of text invisible only if initially I said so?
I.e., I would like to mark some lines throughout the text that would only appear in the compiled pdf if in the beggining of the document I said something like: "those blocks of text ON"; and I don't want them to appear if I said something like "those blocks of text OFF".
The purpose of this is to generate two different documents: one with more deitailed information and another one without those details.
Note that this is not the same as the phantom or comment commands.