Service users in SAP XI?

Question

what are service users in SAP XI?

Answer 1

Hi Ankur,
in XI basically we deal with two type of uses. they are
Service users are used for internal communication between XI components, which is
usually triggered by interaction of dialog users .The service users provide dialog-free
access to the involved XI components. They have SAP user roles in the ABAP part of the SAP
Web Application Server (AS) that are available as user groups in the J2EE part. The Integration Repository is associated with service user XIREPUSER. For each component, service users representing the respective components are created with the appropriate roles in the target components during installation. The passwords of the service users have to be defined during the installation process.
Ex:
Component Service   
Exchange Profile,
System Landscape
Directory
User Role                        
SAP_BC_AI_LANDSCAPE_DB_RFC
Service User
XILDUSER
Dialog users represent human users (as opposed to service users), who log on through the
various UIs of the Integration Builder, System Landscape Directory, and Runtime Workbench.
Dialog users are generally maintained in the ABAP part of the SAP Web AS. The roles for the different dialog users displayed in the following table are predefined and
shipped.
Dialog User Role Description
SAP_XI_DISPLAY_USER-- Read-only access to Integration Directory and
Integration Repository
SAP_XI_DEVELOPER--- Design and development of integration processes
Go to this location and find the documentation.
/sap netweaver/sap netweaver in detail/security/security in Detail/SAP Security Guides