priority?

Hvis du bruger MFC, kan du angive prioriteten som 3. argument til AfxBeginThread

det gør jeg ikke :-( jeg opretter et vindue med createwindow funktionen

Det lader til du kan bruge metoden SetPriorityClass.

(Fra MSDN)
The SetPriorityClass function 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.

BOOL SetPriorityClass(
  HANDLE hProcess,        // handle to process
  DWORD dwPriorityClass  // priority class
);

Priority Meaning
ABOVE_NORMAL_PRIORITY_CLASS Windows 2000: Indicates a process that has priority above NORMAL_PRIORITY_CLASS but below HIGH_PRIORITY_CLASS.
BELOW_NORMAL_PRIORITY_CLASS Windows 2000: Indicates a process that has priority above IDLE_PRIORITY_CLASS but below NORMAL_PRIORITY_CLASS.
HIGH_PRIORITY_CLASS Specify 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 the 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.
IDLE_PRIORITY_CLASS Specify 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.
NORMAL_PRIORITY_CLASS Specify this class for a process with no special scheduling needs.
REALTIME_PRIORITY_CLASS Specify 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.