ution of the spacelike shower defines a new 
initiator parton. It is used, both for the multiparton interactions
and the spacelike showers, to define rescaled parton densities based
on the <i>x</i> and flavours already extracted, and to distinguish 
between valence, sea and companion quarks. Once the perturbative 
evolution is finished, further beam remnants are added to obtain a 
consistent set of flavours. The current physics framework is further 
described in [<a href="Bibliography.html" target="page">Sj