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The TEB on 32-bit Windows is located at fs:[0x0018]. What exactly is found in those 24 bytes between fs:0 and fs:0x18? (Yes, I know this undocumented and subject to change, but it’d be interesting to know…)
It is start of Thread Information Block at FS:[0]. The very first field of this structure is Current Structured Exception Handling (SEH) frame.
Source
It is pointer to Exception Callback Functions linked list head.
BTW it is pretty documented and everything from FS:[0] to FS:[0x1C] (excluding) is not part of change, it is very basic structure, MS would not change it in NT OSes.