T3P is a 3D parallel finite-element time-domain solver to         calculate transient field response of a electromagnetic         structure to imposed fields, and dipole or beam         excitations.
{latex}\begin{eqnarray*}
\left( \epsilon \frac{\partial^2}{\partial t^2} + \sigma_{eff} \frac{\partial}{\partial t} + \nabla \times \mu^{-1}\nabla\times \right) \int^t \emph{E} d \tau = -\emph{J}
\end{eqnarray*}
{latex}