External logins are alternate login names and passwords to be used when communicating with a remote server (in order to set up access to remote database objects).
By default, IQ uses the names and passwords of its clients whenever it connects to a remote server or directory access server on behalf of those clients. However, you can override this default by creating external logins.
When you create a remote server definition, you have the option of creating an external login for your user ID. Using the Create External Login wizard, you can create external logins for other user IDs