Automatically hooked-up Event; called on each screen being received from the host. Calls the onsave event if defined.
This event is provided to assist in data tracking and session state. If another client of the terminal session requests that the session be saved, the active emSess.fnSaveChanges object's function of the FVTermSession will save the changed field values to the host screen. Sometimes when logic wants to "take over" the user's entries still need to be reflected in the active host screen.
Once the fields have been successfully saved at the Inventu Viewer+ Emulation server, this event is called.
The prototype of this function has no parameters and any returned value is ignored.
