Original JO book remains best explanation.


General topic of working with [Tcl] in [C], including pertinent chapters
[http://beedub.com/book/3rd/Cprogint.pdf]
[http://beedub.com/book/3rd/Cbuild.pdf]
from [Brent Welch] book [Book Practical Programming in Tcl and Tk].  
Notice correct emphasis on distinction between C source and its construction.


Clif's book.


Very important:  '''generic/tkSquare.c''' example

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