These definitions are used for the Preprocess command which can be used to preprocess a file and show the results of hiding lines which are not to be included.
"CRiSP is the only UNIX text editor I've seen that would allow a DOS/Windows
user to be immediately productive. But it also has a seemingly
unlimited list of power-user features. I like it so much at work that I
bought it to use at home (under Linux)."