This COM interface is defined and implemented by HL7Connect for use by other applications.This event is called when an interface starts.
Note that there is 2 levels of start. One, the kernel starts the interface (by user prompting, for instance). Then the actual transport layer is allowed to start. This event will only be called when the actual transport layer indicates to the kernel that it has successfully started.
Some carriers (file, http, email) will do this immediately. The LLP carrier will call this event whenever the remote system actually connects. In the context of the LLP interface this could better be called "OnInterfaceConnect"