static LS dm_retrieveConceptsFileFromAllOnlineControllableComputers(S programID) {
  LS computerIDs;
  for (S computerID : computerIDs = dm_onlineControllableComputers()) {
    S path = fsI(programID) + "/" + conceptsFileName();
    dm_retrieveFileFromOtherMachineIfDifferent(computerID, "JavaX-Data/" + path,
      javaxBackupDir("from-" + computerID + "/" + path));
  }
  ret computerIDs;
}