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Kevin wrote: > other words, the memory is not given back to the OS (Windows XP Pro SP2). > Also, we've seen this similar behavior on 2 other machines (also XP SP2). That sounds like you're looking at the file cache. It's impossible for an application to cause that in a modern OS. All operating systems try to store things like file I/O in memory - unused memory is effectively wasted... in an ideal situation the free memory would always be zero since it would be used to its maximum effectiveness - no OS is 'ideal' though (probably not possible in the real world). Tony