appevents AppPriorityClass property
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Applies to
acAppEvents component.  

  TacAppPriorityClass  = (apNormal, apIdle, apHigh, apRealTime);  
property AppPriorityClass: TacAppPriorityClass;  

The AppPriority property determines and sets the priority class for the specified process. This value together with the priority value of each thread of the process determines each thread's base priority level.  
There is a possible values for this property:  
apNormalSpecify this priority class for a process with no special scheduling needs.  
apIdleSpecify this class for a process whose threads run only when the system is idle. The threads of the process are preempted by the threads of any process running in a higher priority class. An example is a screen saver. The idle-priority class is inherited by child processes.  
apHighSpecify this class for a process that performs time-critical tasks that must be executed immediately. The threads of the process preempt the threads of normal or idle priority class processes. An example is Windows Task List, which must respond quickly when called by the user, regardless of the load on the operating system. Use extreme care when using the high-priority class, because a high-priority class application can use nearly all available CPU time.  
apRealTimeSpecify this class for a process that has the highest possible priority. The threads of the process preempt the threads of all other processes, including operating system processes performing important tasks. For example, a real-time process that executes for more than a very brief interval can cause disk caches not to flush or cause the mouse to be unresponsive.