Suitable for processes that demand immediate response from any type of input. High Priority 13 Used for processes that need more immediate responses than normal user applications. The Windows Task Manager is a good example of such an application. The normal application priority level. Idle Priority 4 Idle priority is used for processes that do not demand immediate response time.
Examples are the clock application and screen savers.
Each process can be assigned a priority number between 0-31, where 31 is the highest priority. Each priority class is summarized in Table 1. When a thread is started, it inherits the processes priority. In this way, you can cause individual threads in a process to outpace others. If this were a multiuser situation, one user's process could set other's processes to lower priority giving them a scheduling advantage.