  It is anticipated that the forthcoming Cherenkov Telescope Array (CTA) will
include a number of medium-sized telescopes that are constructed using a
dual-mirror Schwarzschild-Couder configuration. These telescopes will sample a
wide ($8^{\circ}$) field of view using a densely pixelated camera comprising
over $10^{4}$ individual readout channels. A readout frequency congruent with
the expected single-telescope trigger rates would result in substantial data
rates. To ameliorate these data rates, a novel, hardware-level Distributed
Intelligent Array Trigger (DIAT) is envisioned. A copy of the DIAT operates
autonomously at each telescope and uses reduced metadata from a limited subset
of nearby telescopes to veto events prior to camera readout. We present the
results of Monte-Carlo simulations that evaluate the efficacy of a "Parallax
width" discriminator that can be used by the DIAT to efficiently distinguish
between genuine gamma-ray initiated events and unwanted background events that
are initiated by hadronic cosmic rays.
