INT 15 - DESQview v2.26+ - "DISPATCHINT" - INTERRUPT ANOTHER TASK
        AX = DE20h
        BX = segment of handle of task to interupt
        DX:CX -> FAR interrupt routine
        BP,SI,DI,DS,ES as required by interrupt routine
Return: nothing
Notes:  unlike "PGMINT" (AX=1021h), DISPATCHINT may be applied to the task
          making the DISPATCHINT call
        multiple "DISPATCHINT" calls are processed in the order in which they
          were executed
        the FAR routine is entered with the current ES, DS, SI, DI, and BP
          values, using the task's internal stack (see AX=101Ah); only SS:SP
          needs to be preserved
        this API call may be made from within a hardware interrupt handler
SeeAlso: AX=DE2Ah