Apple LaserWriter 12/640 PS - Manual (Page 298)

How does a font look? To see a TrueType or bitmapped font on your screen,
double-click the font’s icon to open it. A sample of that font appears (in three
sizes for TrueType fonts and in the size you opened for bitmapped fonts).
You can also use the Key Caps desk accessory to examine fonts. See the
documentation that came with your computer for instructions.
QuickDraw GX imaging technology
A QuickDraw GX font is a TrueType or PostScript font with an additional set
of sophisticated features. These features include extremely accurate
typographic elements such as ligatures and kerning, plus the ability to skew,
rotate, and add perspective to text in extremely flexible ways.
QuickDraw GX is more than a font format; it’s a sophisticated printing and
display technology that supports complex graphics and advanced typography.
299 Using Fonts With the Printer