Sometimes it is helpful to know what the differences between releases of Tcl/Tk are. Perhaps you want to know how many releases back a feature is available. Perhaps you want to know "What's new?" since your reference book was published. These pages aim to quickly summarize the differences introduced in each release of Tcl/Tk which are visible at the script level. For further details, see the changes file in the Tcl/Tk distribution [L1 ][L2 ].
Commentary on individual changes also appears in "Advantages and disadvantages of different Tcl versions".
See also: Tcl Benchmarks