Аннотация:Various technical aspects of CompHEP version 4.5 applications to the Tevatron and the LHC physics analyses and unweighted event generation are reviewed. Using the channel $pp \to \gamma \gamma\, + 2\, \; jets$ (irreducible background to Higgs boson production by vector boson fusion at the LHC) as an example, we describe the fine tuning of the numerical interface in CompHEP, the efficiency of simplification of flavor combinatorics, the need for parallel processing and mention briefly other recent developments.