Numbering aligned equations

[James Ramsey <jjramsey_6x9eq42@yahoo.com>]

I know that in LaTeX, I can have some lines in a set
of aligned equations numbered and labelled for future
reference, and not others, e.g.

\begin{eqnarray}
\mathrm{Re} &=& \frac{\rho V_{n, avg} d_n}{\mu}
\nonumber\\
&=& \frac{\rho AV_{n,avg}d_n}{\mu A} \nonumber\\[2ex]
&=& \frac{4\dot{m}d_n}{\mu\pi d^2_n} \nonumber\\[2ex]
&=& \frac{4\dot{m}}{\pi\mu d_n} \label{ReynoldsNum}
\end{eqnarray}

In the above equation, only the last equation is
numbered since that's the equation that I'm referring
to in the rest of text (a lab report for a class I'm
taking), and the above lines are just showing the math
manipulations.

I tried to find the equivalent in ConTeXt, but no luck
so far. Is there an equivalent?

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