SSO in web dynpro

Hi all,

I am trying to implement SSO using user mapping or Logon ticket at the group level and not user level(i.e., we have a R/3 id and password mapped to a group in the portal and all the users in that group should use these uid and pwd to login to R/3) in web dynrpo.

Could some one tell me how to I retireve this information using an API (i.e., passing the group id and the system alias name), connect to R/3 and call a BAPI?

Any info on this will be of great help.

Regards,

Narahari