SAP Portal Single Sign On

read more about SSO between BI and Portal in the below links:

SAP Diagnostics and Support Desk Tool

Graphical Description of Portal-BI connectivity

SDN blog on BI Portal SSO

Single Sign On

Single Sign On

Portal 102:

There are many articles about SSO written in SDN,help etc...and here is a collection of blogs on SSO from this blogspot...

SAP Portal System Object

Concept of Single Sign On

SSO logon Ticket theory

SSO Wizard

Checklist for Single Sign On

here is the first lesson: Portal 101

SSO wiki on SDN