WINFONT   FontName  Size  UL|BD|IT

If you do not specify any gadget fonts (with the GADFONT command), then
the default font (the Screen's font) will be used.

You may change this, by declaring a global default font (for this GUI)
with this command.

FontName  - The name of the font e.g.  Topaz.font

Size      - The size of the font. If the size is not found, the diskfont
            library will scale the font to the size requested, but this
            will not look good.

UL|BD|IT  - A Mask (see WinType command) specifying whether the font
            will be UL (Underlined), BD (Bold) or IT (Italic)
            010 for example is a Bold font.