Never mind... I found it... (ta to http://www.mp2kmag.com/mappoint/disc...pic.asp?t=6594)

System.Diagnostics.Process[] processes = System.Diagnostics.Process.GetProcessesByName("Map Point");

foreach (System.Diagnostics.Process process in processes) {
process.PriorityClass = System.Diagnostics.ProcessPriorityClass.Idle;
}