It is possible to have zero-sized memory blocks (i.e. blocks consisting solely of an MCB header). The ALLOC function does not refuse to allocate zero-sized blocks. In addition, zero-sized blocks may be inevitably created in the course of calling other functions. For example, if an existing allocation is resized to be exactly one paragraph smaller, DOS will be forced to create precisely such a zero-sized MCB.
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В фигурном катании захотели запретить критику судейМеждународный союз конькобежцев хочет запретить критику судей в фигурном катании
Nintendo Concepts & Future Developments (Hiroshi Imanishi)
what makes this elegant is that derivatives naturally extend to intersection and complement: