A Tcl 7.[45] object and megawidget extension, supporting multiple inheritance, three new storage classes, and fully transparent Tk megawidgets. If you need a Tab/Notebook widget or a Paned Window widget, but only want to use standard Tk, this extension might be for you. Now has an optional loadable accelerator module (which requires use of Tcl 7.5) . Current version is 0.56.