Code:
#include <windows.h>
using namespace std;

char my_mutex[]     =       "c0D3718yD4n73";


int main(int argc, char *argv[])
{
 HANDLE xetum;
 xetum = CreateMutex(NULL, FALSE, my_mutex);
 if (GetLastError() == ERROR_ALREADY_EXISTS)
        ExitProcess(0);
//////// Mutex ende /////////////

// mach was ....


  system("PAUSE");
  return 0;
}