USBKeys .ini syntax

I have built an A320 MCDU getting much help from Hans Jansen's tutorial, thank you Hans. Using the IOCKeys software I can see that all button are working and I can get key numbers from this. Looking then at the encoder_keys.ini file I can see how to allocate keys to symbols. Can anyone explain to me the syntax which uses \X <X and lower case letters?
Barry
www.a320sim.com

My post below cut short, tried editing. Ah, it doesn't like the symbols, the syntax in Hans example .ini file uses \X "left arrow X" and lower case letters, can anyone explain this please?
Barry