>I have to use a very old FoxBase programwhichg uses the @ row, col notation.
>I have a problem with the font when Prompt command is used
>How can I set the fontname and size for this command ?

This syntax works...

@0,14 prompt " Some prompt " font "georgia,15,I"

...only so far that it doesn't raise an error. But the font it actually displays is the system level defined font for menus. Whatever the user sets in their control panel.