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Tcl/Tk libraries and papers, available at
http://www.scriptics.com/
for the Sun Tcl/Tk pages;
http://www.neosoft.com
for everything related to Tcl/Tk.
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Perl/Tk
documentation.
All widgets are extensively documented. Look for the file
index.html
.
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About Face: The Principles of User-Interface Design.
Alan Cooper. IDG Books Worldwide, 1995.
Forceful, opinionated writing on how GUIs should be designed.
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Bringing Design to Software
. Terry Winograd. Addison-Wesley, 1996.
Has specialists from different fields talking about good design, especially user interfaces.