HttpSession equivalent in WebDynpro

Hi,

1)What is the HttpSession object equivalent in WebDynpro? We need to use feature to store and retrieve some information in user session so that it can be used across multiple webDynpro applications for the user.

2) We would also need to store some information in memmory in application level so that it can be used in multiple applications for all users. Please advice how to achieve this in WebDynpro? Is there any "application" level scope for memmory objects in WebDynpro?

Pls help

regards,

Sujesh