Regardless of how you implement Named Credentials in your app during design time, the functionality and implementation of the credentials remains the same when the app is deployed to the run-time environment. The sequence of events at run time is:

1. The AVEVA OMI framework provides the name of the configured credential to the app. The framework holds the names of all Named Credentials that have been configured in the galaxy, but only the name of the configured credential is provided to the app at run time.
2. The app makes a call into the RunTime API "GetNamedCredentials()," which returns the credential details. The credential details consist of the key-value pair (username and password) associated with the credential name.

For additional information, see Add Named Credentials to Your App.