Open opens a dialog box for opening an existing file.

Annotation[expr, data] represents an expression expr, with annotation data.Annotation[expr, data, " type"] specifies the type of annotation being given.

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 ...

ChoiceDialog[expr] puts up a standard choice dialog that displays expr together with OK and Cancel buttons, and returns True if OK is clicked and False if Cancel is ...

ControlPlacement is an option for Manipulate, TabView, and other control objects that specifies where controls should be placed.

CurveClosed is an option for JoinedCurve that specifies whether individual curve components should be closed curves.

Dashed is a graphics directive specifying that lines that follow should be drawn dashed.

DefaultButton[] represents an OK button that closes a dialog, and is the default when DynamicBox[ToBoxes[If[$OperatingSystem === "MacOSX", "Return", "Enter"], StandardForm], ...

DialogInput[expr] interactively puts up expr as a dialog notebook, waits until a DialogReturn[e] is evaluated from within it, and then returns the result e. DialogInput[{x = ...

Enabled is an option for objects such as Slider that specifies whether the objects should be enabled for interactive manipulation.