How the mainframe applications has been changed in the past 50 years

ID	Stage	Description
1	Green Screen	Limited user community with a limited and very controlled UI
2	Client/server	The user community remains limited, however the UI is increasingly richer.
3	Web/Desktop	Wider user community (anyone with browser), UI controlled by web page (first z Systems web pages were similar in layout to green screens)
4	SOA	Much wider user community, with Service Oriented Architectures reusing existing services and exposing them through decoupled integration methods. The UI is controlled by a service requester application or, in the case of Web 2.0, by the user.
5	Mobile	User community is anyone with a mobile device, rich flexible integrated UI, often reusing services developed for SOA.