Workflow Start Event from ABAP Objects instead of BOR Event

[Workflow]

I noticed in an 6.20 System the other day that the event linkage table
(transaction SWETYPV) allowed the specification of the type of event "ABAP
Object" or "BOR" to be expected by the subscriber.
 
Has anyone already experience with event subscription using ABAP objects
event ?
 
or is this as of yet an SAP internal feature?
 
Nathan