A Monte Carlo program is presented for the computation of the most general
cross section for two-photon production in e+e- collisions at fixed two-photon
invariant mass W. Functions implemented for the five gamma* gamma* structure
functions include three models of the total hadronic cross section and the
lepton-pair production cross section. Prospects of a structure-function
determination through a study of the azimuthal dependence between the two
scattering planes are outlined. All dependences on the electron mass and the
photon virtualities Q_i^2 are fully kept. Special emphasis is put on a
numerically stable evaluation of all variables over the full Q_i^2 range from
Q_{i\min}^2 \sim m_e^2 (W/\sqrt{s})^4 \ll m_e^2 up to Q_{i\max}^2 \sim s. A
comparison is made with an existing Monte Carlo program for lepton-pair
production and an equivalent-photon approximation for hadronic cross sections.Comment: Latex, 29 pages, 7 figures, uses 12pt.sty, epsfig.sty, amsbsy.st
