Keyboard Simulator ('Key Caps')

[Graham Samuel]

I am starting work on an app (cross-platform Mac & PC) where the user  
will be allowed to select certain characters from the repertoire of a  
chosen font: the easiest way to do this visually - at least for the  
Roman alphabet, which is what I need - is by showing a graphic  
representation of a keyboard with the appropriate layout (varies by  
country) and allowing the user to click on a character, with the  
modifier keys (shift etc) working as they do on the real keyboard.  
Apple used to have a Desk Accessory called Key Caps which did just  
that - perhaps this has now been replaced by the Font Panel or the  
Character Palette, neither of which seem to do what I want. I'm not  
sure if Windows XP has/had such a utility.

Has any lister had to offer this feature, and if so, how did they do  
it? Any pointers gratefully received.

Graham
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Graham Samuel / The Living Fossil Co. / UK and France