Portal UME configuration

I have a newly installed portal with NW 7.3 and java d/b as UME. I have worked on configurations where UME is set to ECC systems for the portal. However I also have BI ABAP, SRM ABAP in my landscape.

I thus need to configure SSO between from portal to three different systems (ECC, BI, and SRM)

Please suggest if this is possible.

Thanks,