There's a lot of FUD going on here.
For one thing, our SEH method is not patented. It is a novel method
devised by KJK which doesn't use compiler support as claimed by the
borland patent.
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Here's a simple experiment. Stand on a train track between two
locomotives which are pushing on you with equal force in opposite
directions. You will exhibit no net motion. None the less, you may
soon begin to notice that something important is happening.
The OS-level SEH does use frames on a stack.
Casper