Got asked this today: "Have you ever changed, or had a reason to change or know of a reason why you would change HKLM\System\CurrentControlSet\Control\Session Manager\CriticalSectionTimeout" from it's default value of 30 days?" And the only answer I could come up with was 'code that doesn't handle deadlocks properly' - anyone else got a bright idea? Tia. Andrew Gilwood CS Ltd Registered Office : 197 Leechmere Road, Sunderland, UK, SR2 9DL. No. 6099397 England