T. Sjöstrand and P. Skands
Multiple Interactions and Beam Remnants
submitted to the proceedings of the Workshop on Physics at TeV Colliders, Les Houches, France, 26 May - 6 June 2003

Open issues on the structure of multiple interactions are outlined. An improved model is summarized, with a new approach to correlated parton densities in flavour, colour, longitudinal and transverse momenta, for both hard-scattering partons and beam-remnant ones.

LU TP 04-04