Hello Zopistas FSSession 0-4-2 is available at: http://www.zope.org/Members/gaaros/FSSession FSSession 0-4-2 corrects a bug on Windows platforms where os.rename fails if the renamed file already exists. This version has also been tested under many "unusual" situations (calling FSSession twice, two users having the same SessionUID) and it seems to be very robust. Regards Pavlos