  We study the charge correlations between charm mesons produced in 500 GeV pi-
N interactions and the charged pions produced closest to them in phase space.
With 110,000 fully reconstructed D mesons from experiment E791 at Fermilab, the
correlations are studied as functions of the D-pi - D mass difference and of
Feynman x. We observe significant correlations which appear to originate from a
combination of sources including fragmentation dynamics, resonant decays, and
charge of the beam.
