Can you expand on what you are trying to do? Maybe give an example?

I'm using a text editor to make/change my idf files because I believe that this gives me the most control. (no openstudio, designbuilder ...) I'm trying to discard information without deleting it. The reason for not deleting is that it's easy to make- and track changes within a file without losing information (I think that comparing between two versions of the same file, e.g. with notepad++ or meld, is less efficient ). I have to type a '!' before every line to make E+ 'forget' it and I was wondering if there was an alternative to comment out multiple lines at once.

Thanks, that helps. As far as I know there is no block comment syntax for IDF, you have to put a ! on each line.