Change or get the language used in R and Tcl/Tk
Manipulate R variables and functions from tcl and back
Tk commands associated with the tk2XXX widgets
Edit a matrix or data frame in spreadsheet-like editor
A series of methods applicable to tk2widget or tk2cfglist objects
Display and manage tooltips in Tk widgets
A series of versatile using either themable ttk widgets
Use DDE (Dynamic Data Exchange) under Windows

Tcl/Tk variables and proc, function callback
More Tcl/Tk dialog boxes, font and color selection
Tcl/Tk widgets notebook, combobox, paned window, progress bar, text area, tree
Windows registry, keys, hives, permanent storage of configuration parameters