svoid doPreferredComputerShutDown() {
  S s = trim(loadTextFile(preferredShutDownMethodFile()));
  if (empty(s))
    infoBox("No shut down method set.");
  else if "Power Off"
    cleanPowerOff();
  else if "Suspend to RAM"
    suspendToRAM();
  else if "Suspend to disk"
    suspendToDisk();
  else if "Never shut down"
    infoBox("Never shut down!");
  else
    infoBox("Unknown shut down method: " + s);
}