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We discuss the high-energy production of muon and pion pairs in e +e -colliding beams. All important diagrams in order a%re included. The total cross section is obtained through seven-dimensional numerical integration using a convenient set of mapped covariant variables. Some distributions are given which are relevant for both current and future colliding-beam facilities.

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We discuss several two-photon processes in the energy region covered by the new e +e -colliding-beam machines at DESY and SLAC. ,,In particular we study the observable cross section for q, (and 7,) production using (1) its two-y decay mode and (2) missing-mass techniques. We also discuss the singlephoton' production of new heavy leptons in the presence of a two-photon background via a measurement of the visible energy. Other methods for reducing the two-photon contamination are discussed.