The Standard Model of particle physics makes it possible to simulate c
omplete events for physics signatures and their backgrounds in high-en
ergy collisions. A knowledge of how the produced particles interact wi
th the materials in a detector makes it possible to simulate the respo
nse of any particular detector design of these events and so determine
whether the detector could observe the signal. The combination of the
se techniques has played an important role in the design of new detect
ors, particularly those for hadron supercolliders where the high rates
and small signal cross sections make the experiments difficult. The t
echnique is reviewed here and illustrated using the simulation of the
GEM detector proposed for the Superconducting Super Collider. Although
the simulations and results described here are somewhat detector-spec
ific, we believe that they can serve as a useful model for this compon
ent of detector design for future hadron supercolliders.