TThreadPriority type
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TThreadPriority defines the possible values for the ThreadProperty of the SendMail component, as defined in the following table. Windows schedules threads based on a priority scale; the ThreadPriority property lets you adjust a thread's priority higher or lower on the scale.

Declaration

type
  TThreadPriority = (tpIdle, tpLowest, tpLower, tpNormal, tpHigher, tpHighest, tpTimeCritical);

Values
tpIdleThe thread executes only when the system is idle-Windows won't interrupt other threads to execute a thread with tpIdle priority.  
tpLowestThe thread's priority is two points below normal.  
tpLowerThe thread's priority is one point below normal.  
tpNormalThe thread has normal priority.  
tpHigherThe thread's priority is one point above normal.  
tpHighestThe thread's priority is two points above normal.  
tpTimeCriticalThe thread gets highest priority.  
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