One of the most basic concepts in SAP is that of "Client". A client is defined as a legally and organizationally independent unit within SAP R/3. For purposes of SAP R/3, a client can be company, corporation or even a business unit. One of the first things SAP asks for at the time of login is the client number. SAP R/3 comes inbuilt with three standard clients viz. 000, 001 and 066. Let us see all the three different client's in SAP R/3 in detail.

Client 000 - Client 000 is a special client in SAP since it has client independent settings. Client 000 in SAP R/3 comes with a simple organizational structure. It is a sort of test company. Client 000 contains all standard configurations, parameters, standard transactions, etc that are normally used in the SAP R/3 business environment.

Client 001 - Client 001 is a copy of client 000. Client 001 also includes a test company. Client 001 can be customized to prepare it to move it into the production environment. However, once client 001 is customized, it does not behave like client 000.

Client 066 - Client 066 is used to perform "Early Watch" service for customer systems.

One important thing to remember is that during SAP R/3 implementation, once SAP is installed, the first thing to be done is copy a standard client included in SAP R/3 package. With the help of this, SAP users can start using SAP for creating tests, training, or even start using it for customization.

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