As of UC 10.5, the configuration of multiple users will be supported which allows multiple partition slots to be accessed from a single client instance. This allows customers to add multiple UserID's (a combination of unique AuthTokenClientID, AuthTokenClientSecret, AuthTokenConfigURI) without the need to restart the application after the addition of a new UserID. This will enable a service provider to configure multiple UserID's without impacting the service any of the other users in the same UC instance.
The ability to load multiple partitions to the same UserID without impacting service to other users will also be supported. If an attempt is made to add the same partition ID to a different user that will be ignored and a Warning log will be generated.
More info can be found here: "Dynamic Partition Loading for Luna Cloud HSM Services"