[bruky]

Buenos días JORGETC89,

Te dejo la explicación que consegui hace bastante tiempo:

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


Aun así, te dejo un par de links que resolverán tus dudas:





Espero que esta información pueda serte de ayuda.
Un saludo.