OK. I found www.u3.com. PSPad is portable enough to be able to run U3 platform. With Program settings System []Multiuser environment (unchecked) all data are stored into PSPad folder (all paths are relative). No registry entry are needed.
-- <http://forum.pspad.com/read.php?2,32184,32328> PSPad freeware editor http://www.pspad.com
