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  Where can I get info on porting my Tk3 application to Tk4? to Tk8?
 Get the Tk3 to Tk4 porting notes from  This is also covered in an
appendix in the 2nd edition of Welch`s Tcl/Tk book.  From Tk4 to Tk8,
there were fewer incompatibilities but more major features introduced.
See for a list of the new
features and some notes on upgrading.