Can you tell me some differences between R2 and R3 systems?

Hi,
Can you tell me some differences between R2 and R3 systems?
I guess R2 is used only for mainframe systems some time back. But i dont know why we prefered R3 over R2.
Please clarify this!
Thanks,
Venkatesh.R.

SAP R/3 is
Client server
3 tier
Presentation
Application
Database
Relatively hardware and database independent
ABAP/4 applications runs on application servers.
Dispatcher, shared memory, gateway, work processes are major components of an application server.
SAP R/3 offers
Comprehensive suite of integrated applications meeting the needs of most business
Best practice process design
Ability to configure to
Industry sector
Unique business requirements
In a R/2  System - it is a 2 Tier System based on Mainframe Systems with Intelligent terminals
R/3 is based 3 tier Client Server architechture and supports the R/2 system as well.
R/3 Middleware -
Client server
Uses underlying relational databases
Oracle
SQL server
Ingress
Sybase
Its graphical user interface
Sap GUI
hence R/3 is preffered over R/2 systems because they support Client Server Architecture which is easily configurable,scalable and can integrate with ERP systems and integrate with SOA or Web based Apps.
Thanks,
Saurabh Shukla

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