The button "Comment" will open a small text dialog where you can add a user comment. This comment does not affect how FLUKA performs data analysis, and is only visible to the user.
A commented line will appear as a new line in the table with an icon before the text.
There are two kinds of icons - the first occurs before a regular comment, and the icon resembles the "Comment" button.
The second kind of icon demonstrates TVF's helpful error-checking ability. If the error icon (a purple box with a question mark) appears, it indicates that the original line of text in the loaded input file does not match any accepted FLUKA keywords, and if run would cause FLUKA to throw an exception or crash. Therefore, TVF prevents major problems by converting any unidentifiable lines in the input file into comments. However, because it is still up to the user to prevent any resulting logical errors, TVF uses the error icon to draw attention to the commented line.