Application Program(ming) Interface

[Tcl] ([Tcl syntax help]) and [Tk] ([Tcl syntax help]) both have [script]-level and [C]-level ([Tcl C API]/[Tk C API]) APIs.

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"API considered harmful"
[http://www.itworld.com/nl/xml_prac/04182002/]
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[[ [Category Acronym] ]]