Undo, Redo. Moves the state of the frontmost script back or forward through the undo list.

Cut, Copy, Paste. The usual commands for moving material on and off the clipboard. By default, Copy Value appears when you hold down the Shift key (enabled if the selection is a line of an explorer view).

Paste As String Literal. Pastes the contents of the clipboard, with internal quotation marks, tabs, and line-end characters escaped, and wrapped in quotation marks (unless the insertion point is already inside a string literal).

Paste Tell. Inserts a tell block for a running scriptable application or a known application. If no script window is open, or if you hold down the Option key, creates a new script window containing the tell block.

Delete. Clears the selected text without moving it to the clipboard. Also works on any selectable removable entity (an expression, a library, etc.). Clears the contents of the frontmost tab of the Apple Event Log window if the log window is frontmost.

Complete. Presents a list of possible completions (or the only known completion) for the AppleScript term that starts to the left of the insertion point. Alternatively, press Esc.

Select All. Selects all text in the current selection context.

Balance. Selects surrounding delimiters or block boundaries, or beeps.

Split Editor Vertically, Split Editor Horizontally, Close Split View, Close All Split Views. Manipulates splitting of the script window editing area. By default, Close All Split Views appears when you hold down the Option key.

Shift Left, Shift Right. Removes or adds a level of indentation to the lines containing the selection.

Comment, Uncomment. Adds or removes a level of comment characters to the start of the lines containing the selection.

Entab, Detab. Changes leading indentation to tabs or spaces in the lines containing the selection.

Spelling. Accesses the built-in Mac OS X spell-checking mechanism.

Special Characters… Brings up the system’s Character Palette for entering Unicode characters.