User Types 
The SAP system
categorizes users into several types for different purposes as shown in the
table below:
User Types
Type
|
Purpose
|
Dialog
|
Individual, interactive system
access.
|
System
|
Background
processing and communication within a system (such as RFC users for ALE,
Workflow, TMS, and CUA).
|
Communication
|
Dialog-free
communication for external RFC calls.
|
Service
|
Dialog user
available to a larger, anonymous group of users.
|
Reference
|
General, non-person
related users that allows the assignment of additional identical
authorizations, such as for Internet users created with transaction SU01. No
logon is possible.
|
copied from here
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