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  Description
 
    The SwapVectors procedure swaps the contents of the interrupt
    vectors with values for interrupt vectors stored in system
    variables. SwapVectors takes no arguments.
 
    The System unit defines eighteen pointers used to save interrupt
    vectors. The pointers are named SaveIntnn, where nn is the
    interrupt number.
 
    Call the SwapVectors procedure before and after calling Exec. The
    first call prevents the child process from using any interrupt
    handlers installed by the parent process. The second call restores
    the interrupt vectors for the handlers.