Changes

'''Graphical User Interface''' (GUI),<br/>

Today, most programmers rely on external event driven GUI applications using [https://en.wikipedia.org/wiki/Standard_streams standard streams] or [https://en.wikipedia.org/wiki/Pipeline_%28Unix%29 pipelines] to communicate with the GUI via [[Protocols|protocols]] such as the [[Chess Engine Communication Protocol]] or the [[UCI|Universal Chess Interface]]. The external GUI application constitutes the [https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller MVC] view and controller, and more or less even parts of a (redundant) game model (or even multi-game model), to make the GUI aware of its own game states to even make decisions on behalf of the engine, such as move selection from opening books and [[Endgame Tablebases|endgame tablebases]], draw claims and offers and to finally declare the game over. These game interacting features of the external GUI application in conjunction with certain protocols such as UCI by far exceeds what a pure chess user interface was initially designed for - controller and view only, enter legal moves and render the state of the game. Sharing code of external GUIs, with potential game decisive move selection, time allocation and draw claiming, by multiple engines in official [[Tournamentsand Matches|tournaments]] is a heavily discussed topic <ref>[http://www.talkchess.com/forum/viewtopic.php?t=21168 What's the role of the GUI?] by Zlatnik, [[CCC]], May 15, 2008</ref> .

* [[Dreamer#DreamChess|DreamChess]]* [[DroidFish]]

* [[Hiarcs HIARCS Chess Explorer]]

The notation window represents the [[Game Notation|game notation]] or score-sheet of the chess game, the [[Move List|list of moves]] of the game. It works like a multiple line [https://en.wikipedia.org/wiki/Text_box text box] or multiple column [https://en.wikipedia.org/wiki/Grid_view grid view] or [https://en.wikipedia.org/wiki/List_box list box] often scrollable and indicated by a vertical [https://en.wikipedia.org/wiki/Scrollbar scrollbar]. A [https://en.wikipedia.org/wiki/Cursor_%28computers%29 cursor] inside the notation window might be associated with a [[Ply|half-move index]] in the range from zero (before first half-move played, [[Initial Position|initial position]]), to N (after last half-move played, current game position), and determines the position displayed in the board window. If the game window has keyboard [https://en.wikipedia.org/wiki/Focus_%28computing%29 focus], it receives input of moves via move coordinates or [[Algebraic chess notationChess Notation|algebraic notation]].

Information windows are associated with an engine actually playing or analyzing a game. It displays [[Search|search]] information like [[Principal variationVariation|principal variations]] and associated [[Score|scores]], times and that like. It is often implemented as scrollable logging window, always appending text at top or bottom lines.