ExpressionCell[expr] gives an expression cell that can appear in a Mathematica notebook. ExpressionCell[expr, " style"] gives an expression cell with the specified style.
DragAndDrop is a global front end option that specifies whether to allow drag-and-drop editing.
RotateLabel is an option for graphics and related functions that specifies whether labels on vertical frame axes should be rotated to be vertical.
Style
(Built-in Mathematica Symbol) Style[expr, options] displays with expr formatted using the specified option settings. Style[expr, " style"] uses the option settings for the specified style in the current ...
TextRecognize[image] recognizes text in image and returns it as a string.
Null-terminated text strings. Represents an arbitrary number of null-terminated character strings. Stores characters as 8-bit Unicode values.
$Notebooks is True if Mathematica is being used with a notebook-based front end.
InputField[] represents a blank editable input field. InputField[x] represents an editable input field that currently contains the expression x. InputField[Dynamic[x]] takes ...
PasteButton[expr] represents a button that pastes expr whenever it is pressed. PasteButton[label, expr] displays with label on the button.