Cell > Merge Cells (Mathematica Menu Item)

Merge Cells combines selected cells into one cell.

Window > Messages (Mathematica Menu Item)

Messages displays the Messages notebook.

Cell > Convert To > Metafile (Mathematica Menu Item)

Metafile converts selected cells to Metafile format (Windows only).

Graphics > Operations > Move to Back (Mathematica Menu Item)

Move to Back moves selected graphics objects to the back of the display.

Graphics > Operations > Move to Front (Mathematica Menu Item)

Move to Front moves selected graphics objects to the front of the display.

Insert > Picture > New Graphic (Mathematica Menu Item)

New Graphic creates a new graphic at the insertion point.

File > New (Mathematica Menu Item)

New creates a new notebook, slide show, Demonstration, package, or text document.

Insert > Table/Matrix > New... (Mathematica Menu Item)

New opens a dialog for generating a table or matrix.

Evaluation > Notebook's Default Context (Mathematica Menu Item)

Notebook's Default Context specifies the default context for the current notebook's kernel.

Cell > Notebook History... (Mathematica Menu Item)

Notebook History displays a time record of changes made in the input notebook.