\Configure{htf}{6}{+a}{}{}{<a..
FONT="\%s}{\%s"}{MAG="\%d"}{ORD="\%d"}{>}
$\leq$
\Configure{htf}{6}{+b}{}{}{<b...
FONT="\%s}{\%s"}{MAG="\%d"}{ORD="\%d"}{>}
$\leq$
\Needs{a .......}
\Needs{b .......}
produces
Font class 6 a: <a.. FONT="%s%s"MAG="%d"ORD="%d">
Font class 6 b: <b... FONT="%s%s"MAG="%d"ORD="%d">
l. 27 --- needs --- a ....... ---
l. 28 --- needs --- b ....... ---