Seam jpa-booking example: How is a non-conversation component taking part in conversations?

[infinity2heaven]

I've done a Seam SJB3 project earlier. Revisiting now for a pojo based development. In the seam examples (jpa booking with pojos), the HotelBookingAction doesn't have
a scope @Scope(ScopeType.CONVERSATION). How then is it able to take part in the conversations ie., @Begin selectHotel() :-> bookHotel() :-> setBookingDetails() :-> @End confirm() ?

All throughout the page flow the following values are injected/outjected

@In(required=false) @Out
private Hotel hotel;
 
@In(required=false) 
@Out(required=false)
private Booking booking;

By default pojos are EVENT scoped, how are the above variables cross referenced across pages then?

I guess I'm still unsure of the default scopes of the @In @Out variables