Implementing multiple domain sso in Portal

Hello,

We have a 'domain1.ke' and a 'domain2.com'. We want to configure SSO for both domains. Is it possible? How, if yes. We have already gone through the link 'Configuring Logon Tickets for Multiple Domains - Configuring the Portal for Initial Use - SAP Library', but did not get a clear idea of the same.

Thanks,

Jalpa