Hello,
If you are using SAML you must install SSO Server (NW + SSO 2.0 Add-on).
You can check below links,
SAP Single Sign-On Product Overview
SAP Single Sign-On: Overview Presentation
Single Sign-On with SAML 2.0 - Security and Identity Management - SCN Wiki
https://websmp210.sap-ag.de/~sapidb/012002523100009396052014E.pdf
1808526 - Release Note SAP NetWeaver Single Sign-On 2.0
You can read below blog also;
NW SSO Project Implementation with Apache Reverse Proxy
Yes, end users will loin to systems without entering additional passwords.
Regards,
Yuksel AKCINAR