  We explore a particular approach to study D-brane boundary states in
Berkovits' pure spinor formalism of superstring theories. In this approach one
constructs the boundary states in the relevant conformal field theory by
relaxing the pure spinor constraints. This enables us to write down the open
string boundary conditions for non-BPS D-branes in type II string theories,
generalizing our previous work in light-cone Green-Schwarz formalism. As a
first step to explore how to apply these boundary states for physical
computations we prescribe rules for computing disk one point functions for the
supergravity modes. We also comment on the force computation between two
D-branes and point out that it is hard to make the world-sheet open-closed
duality manifest in this computation.
