Detecting file activity

I once read about some hooks for detecting when files are accessed, read, written, etc but now I can't find them. Can someone point me in the right direction. I need to write an app to process files that are added to a directory. I really don't want to just recheck the directory every so often especially if I can just have NT notify/trigger me when it adds a new file.


thanks

pat

FindFirstChangeNotification(), FindNextChangeNotification(), FindCloseChangeNotification()....