The following notes were removed from the structure-viewing section. Deal with them:

• [Ed. Note: determine if we should discuss here that the system beeps and/or discuss in general elsewhere how the system signals an uneffectual command, including allowing an option for such signaling. See just below for further discussion of this.]
• [Ed. Note: Think about adding a dialog, probably an option-controlled dialog, to each of the above "no effect" cases that says something to the effect of: "No X selected, please select one.", where "X" is one of item, day, week, month, or year. The emacs name of the controlling option would be something like display-dialog-on-no-effect-command.]