In this letter we present a general description of two moving branes in the
presence of the field B-mu nu and gauge fields A(alpha1)(1) and A(alpha2)(
2) on them, in space-time that some of its directions are compact on tori.
Some examples are considered to elucidate this general description. Also th
e contribution of the massless states to the interaction is extracted. Boun
dary state formalism is a useful tool for these considerations.