  ISAJET is a Monte Carlo program which simulates $pp, \bar pp$ and $e^+e^-$
interactions at high energies. This document summarizes the physics underlying
the program and describes how to use it. New features of Version 7.40 include
generation of $W+H$ and $Z+H$ events, non-minimal GMSB models, and use of the
experimental $\alpha_s(M_Z)$ by default.
