Hello , As you write in this week, the DA is commit/rollback automatically. If an error occured, the zope shows it's error page, and I can redefine it. This way is good to the normal web pages, but not too good for others. If I want catch these errors, and show, then two problem I get: try: apply set error=0 except: set error=1 The html page is structured to when error is 1, then it is show normal page with little red errormessage - and it's don't use zope's error page. - In this case I catch the exception, but because not raised again, the DA transaction is committed, not rollbacked. It is wanted to call the rollback directly. - I don't have the exception's errormessage, only if I use traceback module. Can I use that normally in threaded app like Zope ? Thanx for any answers !!! And thanx for answers before this email. -- Best regards, fowlertrainer mailto:fowlertrainer@anonym.hu