Capturing session id in WEBDYNPRO environment

Hi Friends,
I am trying to pass the parameters from webdynpro to BSP using the set server cookies technique. Initially i did it through the same technique from BSP to Webdynpro and i am successful in it. However i am unable to apply the same from webdynpro to BSP.
Below is the one i am using.
CALL METHOD cl_bsp_server_side_cookie=>set_server_cookie
    EXPORTING
      name                  = 'modeldata2'
      application_name      = application_name
      application_namespace = application_namespace
      username              = username
      session_id            = session_id
      data_name             = 'modeldata2'
    importing
      data_value            = ostream.
Here the parameter 'session_id' is picked up from the available RUNTIME object of BSP. And rest of all parameters are some string constants which i could find out.
What is the equivalent object for RUNTIME in webdynpro?
And how do i get the session id in the webdynpro environment.
Any inputs on this?
regards
Nalinikanth.

Thanks for all tthe people who took a look at my question patiently. I got the resolution for the question. I missed out putting the cookie retention time while setting the cookie.

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