Как назначить программе другой приоритет?

HANDLE ProcessHandle, ThreadHandle;
DWORD ProcessID = GetCurrentProcessId();
ProcessHandle = OpenProcess(PROCESS_ALL_ACCESS,false,ProcessID);
SetPriorityClass(ProcessHandle,HIGH_PRIORITY_CLASS);
ThreadHandle = GetCurrentThread();
SetThreadPriority(ThreadHandle,THREAD_PRIORITY_TIME_CRITICAL);