type TTabOrder = -1..32767;
TTabOrder defines the tab order of a control.
TabOrder is the order in which child windows are visited when the user presses the Tab key. The control with the TabOrder value of 0 is the control that has the focus when the form first appears. Subsequent controls in the tab sequence have value 1, 2, 3 and so on.
TTabOrder is the data type used by the TabOrder property.