>Hi Igor,
>
>>* displays 131, "ƒ" and 223, "ß"
>
>I'm not sure what the bug is here? "ß" is a German letter which doesn't have any upper case version because it's never used at the beginning of a word. UPPER("ß") must return "ß" as must LOWER("ß"), anything else would be a bug and screw every single German VFP application out there.

What should IsUpper and IsLower return if upper(letter) = letter = lower(letter)?