  A WEB-portal HepWeb allows users to perform the most popular calculations in
high energy physics - calculations of hadron-hadron, hadron-nucleus and
nucleus-nucleus interaction cross sections as well as calculations of secondary
particles characteristics in the interactions using Monte Carlo event
generators. The List of the generators includes Dubna version of the
intra-nuclear cascade model (CASCADE), FRITIOF model, ultra-relativistic
quantum molecular dynamic model (UrQMD), HIJING model, and AMPT model.
  Setting up the colliding particles/nucleus properties (collision energy, mass
numbers and charges of nuclei, impact parameters of interactions, and number of
generated events) is realized by a WEB interface. A query is processed by a
server, and results are presented to the user as a WEB-page.
  Short descriptions of the installed generators, the WEB interface
implementation and the server operation are given.
