Help > About Mathematica... (Mathematica Menu Item)

About Mathematica opens a notebook containing information about Mathematica.

Edit > Clear (Mathematica Menu Item)

Clear deletes a selection without pasting it to the clipboard.

Cell > Grouping > Close All Subgroups (Mathematica Menu Item)

Close All Subgroups closes all groups in a selection.

Format > Face (Mathematica Menu Item)

Face assigns font face variations (Plain, Bold, Italic, or Underline) to selections.

Cell > Cell Tags > Find Cell Tag (Mathematica Menu Item)

Find Cell Tag opens a submenu to find and select cells based on their cell tags.

[Right-click] > Open in New Window (Mathematica Menu Item)

Open in New Window opens the selected (or clicked upon) documentation link in a new help viewer window.

Graphics > Operations (Mathematica Menu Item)

Operations opens a submenu to control grouping and graphic display placement.

Cell > Convert To > OutputForm (Mathematica Menu Item)

OutputForm converts the selection to Mathematica OutputForm.

Cell > Convert To > Raw InputForm (Mathematica Menu Item)

Raw InputForm converts the selection to Mathematica raw InputForm.

Graphics > Rendering (Mathematica Menu Item)

Rendering opens a submenu to control rendering operations.