Part VI describes C programming and Tcl. The goal of this section is to get you started in the right direction. For serious C programming, you will need to consult the on-line reference material for detailed descriptions of the C APIs.
Chapter 44 provides an introduction to using Tcl at the C programming level. It gets you started with integrating Tcl and Tk into an existing application. Chapter 47 provides a survey of the facilities in the Tcl and Tk C libraries. Chapter 46 presents a sample digital clock Tk widget implementation in C.