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Because of properties of QED, the bremsstrahlung corrections to decays ofparticles or resonances can be calculated, with a good precision, separatelyfrom other effects. Thanks to the widespread use of event records suchcalculations can be embodied into a separate module of Monte Carlo simulationchains, as used in High Energy Experiments of today. The PHOTOS Monte Carloprogram is used for this purpose since nearly 20 years now. In the followingtalk let us review the main ideas and constraints which shaped the programversion of today and enabled it widespread use. We will concentrate speciallyon conflicting requirements originating from the properties of QED matrixelements on one side and degrading (evolving) with time standards of eventrecord(s). These issues, quite common in other modular software applications,become more and more difficult to handle as precision requirements becomehigher.

PHOTOS Monte Carlo for precision simulation of QED in decays - History and properties of the project