"Reinhard Häring-Oldenburg" wrote: ... > Can anybody provide explanantion or further refernces? Ooops forgot the Xanalys (formerly known as Harlequin Language tools) memory management page. http://www.xanalys.com/software_tools/mm/index.html http://www.xanalys.com/software_tools/mm/glossary/w.html#weak.reference(1) Lyman