R/3 что означает буква R? когда то помнил да забыл. Напомните пож-ста.

The 1970s: A Real-Time Vision

In 1972, five former IBM employees -- Dietmar Hopp, Hans-Werner Hector, Hasso Plattner, Klaus Tschira, and Claus Wellenreuther -- launch a company called Systems, Applications, and Products in Data Processing in Mannheim, Germany. Their vision: to develop standard application software for real-time business processing.

One year later, the first financial accounting software is complete, forming the basis for the continuous development of other software components in what later came to be known as the "R/1 system." "R" stands for real-time data processing.

By the end of the decade, intensive examination of SAP's IBM database and dialog control system leads to the birth of SAP R/2.