Set Of

  THookedCommandFlag = (
    hcfInit,     // run before On[User]CommandProcess (outside UndoBlock / should not do execution)
    hcfPreExec,  // Run before CommandProcessor (unless handled by On[User]CommandProcess)
    hcfPostExec, // Run after CommandProcessor (unless handled by On[User]CommandProcess)
    hcfFinish    // Run at the very end
  );
  THookedCommandFlags = set of THookedCommandFlag;