>And what's wrong with ISALPHA([d])?

I don't know since I can not work that quick on more than 10 things at once.

I've tried

LPARAMETERS nKeyCode, nShiftAltCtrl
if between(nKeyCode, 32, 255) and isalpha(chr(nKeyCode))
   NODEFAULT
   DODEFAULT(Asc(Upper(Chr(nKeyCode))),nShiftAltCtrl)   
ENDIF

And in quick tests didn't get errors.

However, Copy-paste obviously didn't work and should be handled separately.