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Tk - originally produced as a TCL scripting language extension - is an open-source and cross-platform widget toolkit with a basic element library for building GUIs and facilitating desktop application development. Tk provides an an integrated group of buttons, menus, scrollbars, list boxes, text and canvas widgets, which facilitate expedited TCL program development.
Tk incorporates various widgets, including buttons, menus, text, frames, labels and canvases, while housing extensions providing non-rectangular, drag-and-drop and native widgets. Tk supports Unicode and Basic Multilingual Planes (BMP).
Tk also helps other dynamic languages run rich applications across Windows, Mac OS X and Linux, and includes bindings for languages like Perl, Python, Ada, Ruby and Common Lisp.
Primary Tk characteristics are:
Primary Tk supported widgets are buttons, check buttons, canvases, entries, frames, labels, list boxes, menus, menu buttons, messages, paned windows, tk_option windows, radio buttons, scales, scroll bars, spin boxes and text.