Tcl/Tk

ALSO CALLED: Tool Kit, Tk
DEFINITION: Tool Kit (Tk) is a companion program to Tool Command Language (Tcl) for creating graphical user interfaces. Together with Tcl, Tk is a rapid program development tool from Scriptics. Both can be ordered from the Scriptics Web site. Tk provides a collection of standard buttons, menus, listboxes, and scrollbars and two special features, the text widget and the canvas widget, that the Tcl programmer  … 
Definition continues below.

TCL/TK DEFINITION (continued): … Tool Kit (Tk) is a companion program to Tool Command Language (Tcl) for creating graphical user interfaces. Together with Tcl, Tk is a rapid program development tool from Scriptics. Both can be ordered from the Scriptics Web site. Tk provides a collection of standard buttons, menus, listboxes, and scrollbars and two special features, the text widget and the canvas widget, that the Tcl programmer can use to speed up program development.In a more general sense, tool kit is synonymous with software development kit (SDK).
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