Part VII describes the changes between versions of Tcl and Tk. These chapters are useful to quickly determine what features were added in each release.
Chapter 51 describes changes in Tcl 7.4 and Tk 4.0.
Chapter 52 describes changes in Tcl 7.5 and Tk 4.1.
Chapter 53 describes changes in Tcl 7.6 and Tk 4.2.
The Tcl and Tk version numbers were unified in the next release, Tcl/Tk 8.0, which is described in Chapter 54.
Chapter 55 describes changes in Tcl/Tk 8.1.
Chapter 56 describes changes in Tcl/Tk 8.2.
Chapter 57 describes changes in Tcl/Tk 8.3.
Chapter 58 describes changes in Tcl/Tk 8.4.
