In the current version the program utilizes the hadronic interaction models EPOS, QGSJET, and DPMJET, which are based on Gribov-Regge theory, and SIBYLL based on a minijet model for high energies. Hadronic interactions at lower energies are described either by the GHEISHA module, by FLUKA, or by the UrQMD model. Electromagnetic interactions are treated by an adapted version of the EGS4 code, customized by including the Landau–Pomeranchuk–Migdal effect relevant at higher energies.