Access webdynpro value from PDK

Hi ,
Can i know how to access a value set in webdynpro from PDK java?
Example
from webdynpro--
WDScopeUtil.put(WDScopeType.CLIENTSESSION_SCOPE, "BP_ID", "value");
i would like to access the BP_ID value from PDK java. Can i know what is the method ?
Thanks in advance.
Sujith

Just to keep you guys informed... found its not possible to solve the above issue because of underlying architecture differences.
Hence to track a session / user, better use cookies which is possible both in pdk and webdynpro.

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