It is very difficult (not to mention potentially confusing) to try and
summarise the integration of one or more software systems
in words, even more so to assign it an image.
I have written several of bespoke interfaces to synchronise databases of
customers, properties and stock product data, in systems including
Capita Open Contractor, Accruent, Orchard, Omniledger Pyramid, Sage and
more. All of these contained businesss logic to handle specific
event driven triggers - e.g. Job creation, arrival, completion etc.