A note on T-duality, open strings in B-field background and canonical transformations

In this paper we study T-duality for open strings ending on branes with non-zero B-field on them from the point of view of canonical transformations. For the particular case of type II strings on the two torus we show that the Sl(2,Z)N transformations can be understood as a sub-class of canonical transformations on the open strings in the B-field background.