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The first version of the Binary Population Synthesizer (BiPoS1) is madepublicly available. It allows to efficiently calculate binary distributionfunctions after the dynamical processing of a realistic population of binarystars during the first few Myr in the hosting embedded star cluster. Instead oftime-consuming N-body simulations, BiPoS1 uses a stellar dynamical operatorwhich determines the fraction of surviving binaries depending on the bindingenergy of the binaries. The stellar dynamical operator depends on the initialstar cluster density as well as the time until the residual gas of the starcluster is expelled. BiPoS1 has also a galactic-field mode, in order tosynthesize the stellar population of a whole galaxy. At the time of gasexpulsion, the dynamical processing of the binary population is assumed toefficiently end due to the subsequent expansion of the star cluster. WhileBiPoS1 $has been used previously unpublished, here we demonstrate its use inthe modelling of the binary populations in the Orion Nebula Cluster, in OBassociations and as an input for simulations of globular clusters.

BiPoS1 -- a computer programme for the dynamical processing of the initial binary star population