Single SignOn in webdynpro ABAP

Hi,
I am pretty new in Netweaver Portal side and recently got an requirement from a customer for single Sign on:
Requirement -
We already had a SSO set up with MS Windows with SAP Portal. Hence in order to open SAP Portal, user has to use his Window's credential (Usually Company's own network credentials) instead of SAP credentials.
Now customer also has another legacy portal where  client has similar SSO set up.
Recently we had implemented SAP Learner Portal (SAP LSO Solution) and now user should directed to legacy portal only when he/she clicks a button in SAP portal's application (Webdynpro ABAP).
Therefore, we need to implement same SSO inside Webdynpro Action. Please suggest me what should be our approach of doing so.
Will APIs like IF_WD_PORTAL_MANAGER be handy ?

Enable SSO between the portal and the AS ABAP system hosting the WDA. Using SAP Logon Tickets is the simplest way. Then access the WDA through the portal. That way you will have SSO since portal already has SSO using Windows Credentials. Another option is to enable SSO in the AS ABAP system hosting the WDA. Your options include at least SPNEGO for ABAP (part of the NWSSO suite), X.509 certificates and SAML.

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