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User Management Engine 
SAP Enterprise Portal 6.0 uses the User Management Engine (UME) 4.0 to enable integration of the portal with a existing LDAP or user management solution. The UME is used by the SAP NetWeaver platform.
This document describes how to develop customized applications with the UME that is provided by the SAP Web AS Java and the SAP Enterprise Portal.
From the application point-of-view, the UME provides three main functions:
· Authentication: Which user is logged in
· Authorization: What the user is allowed to do
· Profile: Details of user like user name, address and so on
See
the SAP Web AS Java documentation
Identity
Management for more details about the authentication concept. This
document is also available on the SAP Help
Portal at
http://help.sap.com.