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The Deferred Task Manager call DTInstall is replaced by QueueSecondaryInterruptHandler and CallSecondaryInterruptHandler2. These routines are discussed in Secondary Interrupt Handlers.
The Deferred Task Manager maintains a queue of deferred tasks that run after hardware interrupts but before the return to the application level. The new mechanisms allow a deferred task, now called a secondary interrupt handler, to be queued or run on the fly. The operating-system mechanisms used to manage secondary interrupts are no longer visible to clients of the scheduling routines. The deferred task structure itself is no longer allocated by the requesting application.