Connecting LDAP from ECC

Hi Experts,

I have one question, I need your help regarding this.

I have configured SSO from EP through LDAP.

If my client is using only ECC6.0 EHP4 not EP, how to maintain SSO.

Can I do SSO with LDAP in ECC(in absence of portal) ?

Is it possible that LDAP's user will connect to SAP ABAP ECC6.0 / BI / SRM7.0 using LDAP server?

Thanjs a lot in advance.