http://purl.org/tcl/home/man/tcl8.4/TkCmd/font.htm

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This command encapsulates a huge amount of knowledge that's difficult
to locate otherwise.  The newsgroup thread
[http://groups.google.com/groups?hl=en&frame=right&th=da7154f3dad32ca9]
explains several key points about practices under Microsoft Windows which we'll eventually transcribe here.
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Here's how to change a font to italic without having to specify it in full (e.g. if you otherwise want to use the default settings):

 button .b ;# as guinea pig for testing
 array set attributes [font actual [.b cget -font]]
 set attributes(-slant) italic
 set font [eval font create [array get attributes]] 
 .b configure -font $font 
Found by [Pat Thoyts] in the [Tcl chatroom]. I think you can even bypass the "font create" bit and directly say
 .b configure -font [array get $attributes] ;# RS


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