Hello Veera ,
Hope you looking for this ....
Characterization of user types
Dialog user 'A'
Individual system access (personalized)
Logon with SAPGUI is possible. The user is therefore interaction-capable with the SAPGUI.
Expired or initial passwords are checked.
Users have the option of changing their own passwords.
Multiple logon is checked.
Usage: For individual human users (also Internet users)
System user 'B'
System-dependent and system-internal operations
Logon with SAPGUI is not possible. The user is therefore not interaction-capable with the SAPGUI.
The passwords are not subject to to the password change requirement, that is, they cannot be initial or expired.
Only an administrator user can change the password.
Multiple logon is permitted.
Usage: Internal RFC, background processing, external RFC (for example, ALE, workflow, TMS, CUA)
Communication user 'C'
Individual system access (personalized)
Logon with SAPGUI is not possible. The user is therefore not interaction-capable with the SAPGUI.
Expired or initial passwords are checked but the conversion of the password change requirement that applies in principle to all users depends on the caller (interactive/not interactive). (*)
Users have the option of changing their own passwords.
Usage: external RFC (individual human users)
Service user 'S'
Shared system access (anonymous)
Logon with SAPGUI is possible. The user is therefore interaction-capable with the SAPGUI.
The passwords are not subject to the password change requirement, that is, they cannot be initial or expired.
Only a user administrator can change the password.
Multiple logon is permitted.
Usage: Anonymous system access (for example, public Web services)
Reference user 'L'
Authorization enhancement
No logon possible.
Reference users are used for authorization assignment to other users.
Usage: Internet users with identical authorizations
Regards ,
Santosh
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