Well, I don't think, exactly this is possible in PSPad (of course, codefolding isn't supported either). You can achieve something similar using multiple instances of the program (Settings:: System integration :: [ ] One instance ...)
(viz http://vbr.wz.cz/pspad/PSPad-2-instances.jpg ) Or (as multiple instances can be less handy) you can simly use the multiple document view in one instance: (viz http://vbr.wz.cz/pspad/PSPad-MDI.jpg ) -- <http://forum.pspad.com/read.php?2,47028,47038> PSPad freeware editor http://www.pspad.com
