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: 

   -"Tk_GetPixels" and "Tk_GetScrennMM"::   1)we take the screen units <<br>> 2)make a page titled " ScrennUnits" that contains those screen units <<br>> 2)redirect the user to your "Tk C API". <<br>>=> result: <<br>> [screen units]

And we do the same things for others:

-"Tk_GetBitmap: [Bitmap Images]

-"Uk_GetColor": [Color Formats]

-"Tk_GetCursor": [Cursors List]

-"Tk_GetVisual": [Visual Classes]