Siebel Portal Framework Guide > About Siebel Portal Framework > Portal Framework Architecture >
Portal Agents provide you with a mechanism to retrieve content from a non-Siebel source and display it in the Siebel user interface. The Portal Agent retrieves content on behalf of the user, logging on to the external application using the user's credentials and retrieving only the content that is targeted for the user. Portal Agents provide single sign-on capability and a profile tracking mechanism.
See Understanding Portal Agents for more information about Portal Agents.