Changes the priority of a process.
ProcessSetPriority ( "process", priority )
| process | The name or PID of the process to check. | 
| priority | A flag which determines what priority to set $PROCESS_LOW (0) = Idle/Low $PROCESS_BELOWNORMAL (1) = Below Normal $PROCESS_NORMAL (2) = Normal $PROCESS_ABOVENORMAL (3) = Above Normal $PROCESS_HIGH (4) = High $PROCESS_REALTIME (5) = Realtime (Use with caution, may make the system unstable) Constants are define in "AutoItConstants.au3". | 
| Success: | 1. | 
| Failure: | 0 and sets the @error flag to non-zero. | 
| @error: | 1. 2 if attempting to use an unsupported priority class. | 
Example()
Func Example()
    ; Run Notepad
    Run("notepad.exe")
    ; Wait 10 seconds for the Notepad window to appear.
    Local $hWnd = WinWait("[CLASS:Notepad]", "", 10)
    ; Set the priority of the Notepad process to "Idle/Low".
    ProcessSetPriority("notepad.exe", 0)
    ; Wait for 2 seconds.
    Sleep(2000)
    ; Close the Notepad window using the handle returned by WinWait.
    WinClose($hWnd)
EndFunc   ;==>Example