Chapter 50. Tcl 7.6/Tk 4.2
Tk 4.2 saw improvements in its cross-platform support., including virtual events, additions to the file command, improvements to the exec command on Windows, and the addition of common dialogs for choosing colors and selecting files. The grid geometry manager was rebuilt to improve its layout algorithm.
Grid saw a major rewrite for Tk 4.2 to improve its layout algorithm. Cross-platform scripts were enhanced by the addition of standard dialogs and virtual events. Tcl 7.6 saw improvements in exec and pipelines on Windows. The Macintosh version got a significant performance boost from a new memory allocator.