Tab set controls are commonly used to display tabbed pages within a dialog box.
The TTabControl control can be used to add a control with multiple tab settings to a form. The TTabSet control presents horizontal tabs users can click to initiate actions.
Both TTabSet and TTabControl are a single object (not made up of several pages hosting different controls, like the case is with TPageControl). When the current tab changes, the tab control must directly update its contents to reflect the change in an OnChange event handler.
To have a set of tabs for the tab set control you specify a list of strings as the value of the Tabs property. Ever wondered how to have specific hint for each tab?
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Say you are developing a game like Chess, Go, Checkers, Tic-Tac-Toe or Memory. In each of those games the game board is a rectangle looking playfield of different size (rows x columns). Tic-Tac-Toe is 3×3, Checkers is 8×8, while Go can be 19×19 or 13×13 and similar. 
The second law of thermodynamics, in short version and when read by a programmer, states that “any collection of objects tends not to be sorted” 🙂
In one of my applications, a tab on the page control hosts a TWebBrowser displaying PDF (and other supported) documents. Having the “PDF View” tab active, other tabs of the page control are hidden from the user – as this is how the page control functions.
I’m sure you’ve seen it already. When the program starts it takes a picture of the current desktop, the picture is then cut into a number of rectangular pieces (all of the same size). A piece at some random position is “removed”. The main code randomly swaps that piece with the one next to it. Only pieces adjacent to the removed one can be moved into it.
Ah, nostalgia.
Finally, last step in making my (/your) Delphi application not only 