PropertyHandle :: StartRTA - Start read transaction

Starting a read transaction will cache all system events generated for external registered application resources (RegisterHandle()). The last event for each event class is cached. Caching a higher class events will remove lower class events. The level of an event class is defined by its enumeration value.

Cached events will be released, when the last read transaction is closed. Read transactions are registered on the database object level and can be created here ) for convenience.