15 If a memory resident program replaces one of the interrupt vectors, how can it still take advantage of some functions in the interrupts existing handler

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15  If a memory resident program replaces one of the interrupt vectors, how can it still take advantage of some functions in the interrupts existing handler

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Question: 15. If a memory-resident program replaces one of the interrupt vectors, how can it still take advantage of some functions in the interrupts existing handler?

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