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LCODE is a freely-distributed code for simulations of particle beam-driven plasma wakefield acceleration. The code is 2-dimensional (2d3v), with both plane and axisymmetric geometries possible. In the code, the simulation window moves with the light velocity, and the quasi-static approximation is used for calculating plasma response. The beams are modeled by fully relativistic macro-particles. The plasma is modeled either by macro-particles (kinetic solver), or as the electron fluid (fluid solver). Transversely inhomogeneous plasmas, non-neutral plasmas, and mobile ions are possible with the kinetic solver. The code is furnished with extensive diagnosing tools which include the possibility of graphical presentation of the results.