The Undo item changes according to the previous action. It changes from Can't Undo to Undo Move, for example, if you have just moved a headline in an outline document.
All option is context-sensitive.
For example, it selects all of the text in a word processing text document. In a script or outline, it selects all of the text in the current heading. In a table, it selects the entire name of the current object. These are standard font and styles options. Notice that Frontier dims the last three choices unless you are editing a word processing text document.