Share session information between modules?

[David Cuenca]

I would like to know if we can share information between ofbiz modules
as if they were a unique webapp, as if the modules were sharing the same
session.
Ofbiz uses the externalLoginKey to know if a user has to log-in when he
requests a new module. But, besides, I would like to have the same
session information each time I change between modules.
It is true that each module/webapp has its own session and the
information cannot be shared between them?