This dialog box is used to set the comment delimiters used when reformatting text. Typically this happens when you use <Ctrl-F>or the Comment or Comment box commands on the EditText formatting submenu.
"I am a newcomer to Linux, and I was very disappointed with "standard" UNIX editors like vi and emacs. The user interface is so unfriendly and the feature set is so antiquated. I heard about CRiSP on the comp.editors newsgroup and downloaded a free demo...It's just wonderful! Thoroughly modern, easy to use, powerful, flexible; it's what a UNIX programmer's editor should be."