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From: Taco Hoekwater <taco.hoekwater@wkap.nl>
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Subject: Re: Itemize..
Date: Fri, 14 Jan 2000 14:39:58 +0000 (GMT)
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    >> 3. This one is related to tables: I have
    >> \starttable[|p(6cm)|M|].  In one row of the table (second
    >> column) I happen to have \eqalign with two rows. The top of the
    >> paragraph is aligned with the middle of \eqalign. How can I
    >> make the middled of the paragraph be aligned with the middle of
    >> eqalign (I'm talking about vertical centering)?

    Hans> Something for taco since it's math.

Not really math, more of a TaBlE omission. Try this code, which gives
you the new key P (just like p) for a vertically centered paragraph.

%%%%%%%%%%%%%%%%%%%%%%
\unprotect
\def\BeginTableParCBox#1{%
  $\displaystyle\m@th\vcenter\bgroup\vtop\bgroup
    \hsize=#1
    \normalbaselines
    \let~=\!ttTie
    \let\-=\!ttDH
    \the\EveryTableParBox}

\def\EndTableParCBox{%
    \MakeStrut{0pt}{\StrutDepthFactor\StrutUnit}
  \egroup\egroup$} % finishes the \vtop begun by \BeginTableParbox

\NewFormatKey P{%
  \!tgGetValue{\!tgSetUpParCBox}}

\def\!tgSetUpParCBox{%
  \edef\!ttemp{%
    \noexpand \ReadFormatKeys
    b{\noexpand \BeginTableParCBox{%
      \ifnum \!tgCode=1
        \ifx \!tgValue\empty
          \the\ColumnWidthFactor
        \else
          \!tgValue    % user-specified integer
        \fi
        \!taCWU        % \ColumnWidthUnit
      \else
        \!tgValue      % user-specified dimension
      \fi}}}%
  \!ttemp
  a{\EndTableParCBox}}

\protect
%%%%%%%%%%%%%%%%%%%%%%

[There is a similar problem for bottom aligned paragraphs (\vbot
 instead of \vtop), but I can't find a suitable key for that].

Or you could put the \eqalign in a parbox itself, I think, like this: 

\starttable[|p(6cm)|p(6cm)|]
\NC .. \NC $\displaystyle\eqalign{...}$\NC\NR
\stoptable

(in this case, they start on the same baseline).

Greetings, Taco