palette,
and which color, if any, is really transparent.
<tt>BITMAPPALETTE</tt> takes a file containing one color per line, each
consisting of decimal red, green, and blue components (0..255) separated
by whitespace.

<p>
The flexible bitmap family syntax is the only way to specify high-density
bitmaps.  Individual bitmaps are added to the family as specified by their
<tt>BPP</tt> and <tt>DENSITY</tt> values, and attributes can be specified
for each individual bitmap separately:
</p><pre class="syntax">BITM