Josh

Very many thanks for your reply.

>Well you can still use a text box with Y in the inputmask.<

I tried that and it didn't appear to work. I will look again.

>LPARAMETERS nKeyCode, nShiftAltCtrl
>
>IF nKeyCode=13
> NODEFAULT
> KEYBOARD "{TAB}"
>ENDIF

This is also a simple, but very good idea. On balance, I think this allows me to use a check box because the only real problem with a Y/N text box is that amending a value with a mouse is not natively possible without setting focus to the field and retyping the amended value.

Thank you once again. Much appreciated.