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using System;
using System.Diagnostics;

namespace ConsoleApplication1
{
    class Program
    {
        static string pp;

        static void Main(string[] args)
        {
            foreach (Process process in Process.GetProcesses())
            {
                try
                {
                    if ( [HIER WEIß ICH NICHT] )
                    {
                        process.PriorityClass = "low"; // ich weiß nicht ob "low" möglich ist
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.ToString());
                }
            }
            Console.ReadLine();
        }
    }
}