  In this document the simulation part of the Hellenic Open University
Reconstruction & Simulation (HOURS) software package is described in detail.
HOURS can be used for the generation, simulation, pattern recognition and
reconstruction of high energy neutrino produced events in a very large volume
neutrino telescope. The objective is to provide as accurate as possible a
representation of event properties in a wide range of neutrino telescope
configurations and medium optical properties. Moreover, HOURS contains software
for the simulation and reconstruction of Extensive Air Showers (EAS) using the
HEllenic LYceum Cosmic Observatories Network (HELYCON) scintillation counters.
Using the information offered by the simulation/reconstruction of any EAS, and
by considering the showers' energetic muons that penetrate the sea to the depth
of the neutrino telescope, it is possible to study the joint performance of the
neutrino and EAS detectors for physics or calibration purposes. HOURS has been
used extensively for the optimization, development of calibration techniques
and performance evaluation of the planned Mediterranean neutrino telescope,
KM3NeT (km 3 Neutrino Telescope). The results of these studies have been
published to various international scientific journals. The code and further
information may be found on the HOURS web page:
http://physicslab.eap.gr/EN/Simulation_software.html .
