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Defining SAP R/2 and R/3

Our expert defines and differentiates between the SAP systems R/2 and R/3.

A trivial question, but I am interested in the answer:

What do the two and three stand for in the SAP names R/2 and R/3? As I understand it, they are defined as two-tier for the main frame in R/2 and three-tier for the client server in R/3. Please confirm if this is correct.

R/2 and R/3 are SAP releases. R/2 stands for Runtime System 2 and R/3 stands for Runtime System 3. In other words, the second and third releases of the SAP software.

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