[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.

Cell > Cell Properties > Open (Mathematica Menu Item)

Open toggles a cell between open and closed.

Edit > Paste (Mathematica Menu Item)

Paste inserts the current contents of the clipboard at the insertion point.

Insert > Picture (Mathematica Menu Item)

Picture inserts a picture from a file or inserts an empty graphic at the insertion point.

Insert > Table/Matrix > Split Spanning (Mathematica Menu Item)

Split Spanning divides a spanning entry from a formatted grid into separate entries.

Evaluation > Start Kernel (Mathematica Menu Item)

Start Kernel starts the specified kernel.

Help > Wolfram Website... (Mathematica Menu Item)

Wolfram Website opens the main Wolfram Research website in a web brower.

AutorunSequencing (Built-in Mathematica Symbol)

AutorunSequencing is an option for Manipulate that specifies how autorun should use the controls provided.

ButtonNotebook (Built-in Mathematica Symbol)

ButtonNotebook[] gives the notebook, if any, that contains the button which initiated the current evaluation.

CancelButton (Built-in Mathematica Symbol)

CancelButton[] represents a Cancel button in a dialog that closes the dialog window when clicked.CancelButton[action] represents a button labeled Cancel that evaluates action ...