Even a widget as simple as a label has some 20 different settings (also known as properties) that can affect its look and feel. Typically, the author of a Tk program will alter a minimum of these, as all resources have a default or "fallback" value. Users can override fallbacks through general setting files, and through files that include settings for specific applications. Programmers can give users the option of loading sets of resources from file as well. Resource setting is useful for applications which may be used by people with poor sight or who are colour blind, and also for giving a consistent look and feel to a group of related windows or applications.

This topic is presented on public course Tcl/Tk

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lookandfeel	demonstration file of Tk resources
resource3	Resources file for tk_res3
skeleton	template for resource exercise
tk_res3	Use of two files of Tk resources