See: Description
| Interface | Description | 
|---|---|
| ISessionCache | 
| Class | Description | 
|---|---|
| YAbstractSession | Base class which represents an active session between the engine and an external
 service or application. | 
| YClient | Base class that defines a custom service or external client application, in
 particular their session authentication credentials. | 
| YExternalClient | Represents the authentication credentials of an external application that may connect
 to the Engine via the various interfaces (as opposed to a custom service). | 
| YExternalSession | Maintains an active session belonging to an external application client. | 
| YServiceSession | Maintains an active session belonging to a custom service. | 
| YSession | Base class which represents an active session between the engine and an external
 service or application. | 
| YSessionCache | An extended HashMap that manages connections to the engine from custom services
 and external applications. | 
| YSessionTimer | 
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