User Administration 
The administration of ICF users in SAP systems is performed using the general SAP user administration functions (transaction SU01).
In principle, ICF users can have any user type (system user, dialog user, individual user, composite user).
Note
For security reasons, use only system users for ICF communications, if possible, to avoid accessing dialog processes. However, depending on the application, you may need to set up dialog type ICF users.