\Configure{equation}
{\Configure{gather}
{\HCode{<\tbl:XV{equation}><tr><td><center>}\IgnorePar}
{\end:TTT\IgnorePar\par}
{}{}
{\ifnum\HCol=2 \IgnorePar\HCode{</center></td><td width="5\%">}\fi}
{}
}{}{}
-_-_-
\Configure{equation}
{\NoHtmlEnv \Configure{gather}
{\HCode{<\tbl:XV{equation}><tr><td><center>}\IgnorePar}
{\end:TTT\IgnorePar\par}
{\Configure{$}{\PicMath}{\EndPicMath}{}}
{}
{\ifnum\HCol=2 \IgnorePar\HCode{</center></td><td width="5\%">}\fi}
{}
}{}{}
-_-_-
Equations in amsmath.sty are defined in term of gather, and gather is a one
parameter macro. Unlike laktex where the body is read within the environment, in
gather it is read at the \begin{equation} point under the conditions that exist
there.
\Configure{substack}{\Picture+{}}{\EndPicture}
-_-_-