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6 3 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. text text-manipulation share | improve this question asked D