Here are the classes, structs, unions and interfaces with brief descriptions:

CLSClient	Incapsulates a single connection to Lightstreamer Server
CLSConnectionConstraints	Collects the constraints to be applied on the overall data flow from a Connection
C<LSConnectionDelegate>	The LSConnectionDelegate protocol receives notifications of connection activity and errors
CLSConnectionInfo	Collects the parameters related to a connection request to Lightstreamer Server
CLSException	Base class of all Lightstreamer client exceptions
CLSExtendedTableInfo	Specification of a table to be subscribed to Lightstreamer Server, comprised all the item and field names
CLSLog	Controls the local logging system
C<LSLogDelegate>	The LSLogDelegate protocol can be used to redirect the local logging system to a different destination, such as a file or an application-wide logging system
C<LSMessageDelegate>	The LSMessageDelegate protocol receives notifications of server responses to sent messages
CLSMessageInfo	Message object that will be sent to a Lightstreamer Server
CLSMPNInfo	Table and format specification of mobile push notifications (MPN) to be sent on the update of an MPN subscription
CLSMPNKey	Subscription ID to be used to access an MPN subscription
CLSMPNStatusInfo	Additional information about the status of a mobile push notification (MPN) subscription (see checkStatus (LSMPNSubscription)) and its related device
CLSMPNSubscription	Wraps the key (as an LSMPNKey object) and the specifications (as an LSMPNInfo object) of a mobile push notifications (MPN) subscription
CLSMPNTokenChangeInfo	Additional information about the result of a device token change on the Server (see LSConnectionDelegate::didSucceedChangingDeviceTokenOnServerWithInfo:)
CLSPushClientException	Incapsulates exceptions thrown due to client-side problems, such as invalid parameters for a request
CLSPushConnectionException	Incapsulates exceptions thrown due to connectivity problems with the Server
CLSPushServerException	Incapsulates exceptions thrown due to a specific error returned by the Server
CLSPushUpdateException	Incapsulates exceptions thrown due to unexpected or wrong data updates received from the Server
CLSSubscribedTableKey	Key value to be used to unsubscribe from tables
CLSSubscriptionConstraints	Collects the constraints to be applied on the data flow from a Subscription
C<LSTableDelegate>	The LSTableDelegate protocol receives notification of data updates and subscription termination for a table
CLSTableInfo	Specification of a table to be subscribed to Lightstreamer Server
CLSUpdateInfo	Information about an update for a subscribed item