This page contains two Physlets that are able to share data using their common superclass, SApplet. The Molecular Physlet is able to tag a particle as a data source. In particular, any tagged particle can deliver x, y, vx, and vy values to a data listener. This script tags two particles and assigns these data sources to two different series in the DataGraph Physlet. The connection can show any analytic function of the position and velocity components including the particle speed or kinetic energy.