SAP R/3 and Basis Plugin
http://service.sap.com/r3-plug-ins
Support Tool Plug-ins (ST-pi & ST-A/PI)
http://service.sap.com/supporttools
Support Packages in Stacks
http://service.sap.com/sp-stacks
Installation/Upgrade Guides
http://service.sap.com/instguides
Component Specific Upgrade
http://service.sap.com/upgrade-bw
http://service.sap.com/upgrade-crm
Availability Matrix
http://service.sap.com/platforms
Help