I use pelles c from about half a year ago, and I download the new 4.0 version several days ago. I can not find an option to show the right margin line in source editor, that can help me not write a line too long. so I write this simple addin. you can set the line position(default is 80) and line color. of course, you'd better use a monospace font, my favorite is courier new, it's a font for programmers. the attachment include source code and binary dll file.