Joe, I found that out as well. What I'd like to know is not what it does per se - but if anyone has ever come across the need to change it. From what I've read I'd suggest that someone has changed it because they couldn't get code fixed for one reason or another . From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Shonk Sent: 08 December 2007 04:22 To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: CriticalSectionTimeout Tim could probably expand on this, but based on a little light reading on a Friday Night you could respond like this: Your applications utilizes critical sections and you don't want wait 30 days for the system to resolve deadlocks. or The value of the CriticalSectionTimeout is not used unless the value is equal to or under 3600 (1 hour) secs. Joe On Dec 7, 2007 5:33 PM, Andrew Wood < andrew.wood@xxxxxxxxxxxxxxxx <mailto:andrew.wood@xxxxxxxxxxxxxxxx> > wrote: Got asked this today: "Ha ve 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 Ro ad, Sunderland, UK, SR2 9DL. No. 6099397 England