I already started this topic in your forum
https://groups.google.com/forum/#!topic/comp.lang.tcl/cvSup2muQc0
"Tk C API" are difficult to work with for usual users, no it is impossible to work with, My suggestions is to take the essentials of each element of "Tk C API", give it a new title that express its utility and inside its content you redirect users with high experience's level to your "Tk C API", exemple:
And we do the same things for others:
-"Tk_GetBitmap: Bitmap Images
-"Uk_GetColor": Color Formats
-"Tk_GetCursor": Cursors List
-"Tk_GetVisual": Visual Classes