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NTSTATUS KeWaitForSingleObject(
    IN PVOID Object,
    IN KWAIT_REASON WaitReason,
    IN KPROCESSOR_MODE WaitMode,
    IN BOOLEAN Alertable,
    IN PLARGE_INTEGER Timeout OPTIONAL   // Pointer to a time-out value that specifies the absolute or relative time, in 100 nanosecond units, 
    );


VOID KeStallExecutionProcessor(
    IN ULONG MicroSeconds                    // </em>Specifies the number of microseconds to stall.
    );

BOOLEAN KeSetTimer(
    IN PKTIMER Timer,
    IN LARGE_INTEGER DueTime, // Specifies the absolute or relative time at which the timer is to expire. If the value of the <em>DueTime</em> parameter is negative, the expiration time is relative to the current system time. Otherwise, the expiration time is absolute. The expiration time is expressed in system time units (100-nanosecond intervals). Absolute expiration times track any changes in the system time; relative expiration times are not affected by system time changes. 
    IN PKDPC Dpc OPTIONAL
    );