A couple of years ago, Chris Heller wrote a great article on editing PeopleSoft files with the Notepad++ text editor. Since I prefer jEdit over Notepad++ (my jEdit fascination dates back to my Java programming roots and, more recently, the jEdit Ruby plugin). I have a collection of custom jEdit syntax files in my box.net jEdit shared folder. In this folder, you will find DMS and PeopleCode syntax files (unlike Notepad++, jEdit includes SQR syntax files out of the box). Feel free to download and use these files. Caveat: these files are far from complete. I add to them on an as-needed basis. If you find errors and/or omissions, please leave a comment here, and I'll do my best to update my shared syntax files. See the jEdit help file for how to add these syntax files to jEdit (hint: jEdit calls syntax files "Edit Modes").
By the way, jEdit has a Code2HTML plugin. I use the syntax files in my shared folder along with the Code2HTML plugin to generate the syntax highlighting used on this blog.