  The relation among spacetime supersymmetry algebras and superbrane actions is
further explored. It is proved that $SL(2,\bR)$ belongs to the automorphism
group of the ${\cal N}=2$ D=10 type IIB SuperPoincar\'e algebra. Its SO(2)
subgroup is identified with a non-local SO(2) transformation found in
hep-th/9806161. Performing T-duality, new non-local transformations are found
in type IIA relating, among others, BIon configurations with two D2-branes
intersecting at a point. Its M-theory origin is explained. These results show
that part of the SuperPoincar\'e algebra automorphism group might be realized
on the field theory as non-local transformations.

High Energy Physics - Theory