Try E₄: misses point(s)
The SETBLOCK function always sets the MCB owner when it succeeds. That is, a DOS process may resize any existing memory block, regardless of who owns it, and become the owner. If the resizing succeeds (and resizing to the same or smaller size always will), the calling process will become the owner of the block. Obviously, resizing memory blocks owned by other processes is a risky business.
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