Difference between client 000 and 001.

Hi,
what is the difference between vclient 000 and 001 ?
Best regards

000: SAP standard client
This client is used to set up new "neutral" clients by client copy. Do not change or delete this client.
This is an SAP referce client
Every time an SAP system is installed the 000 client is created by default woth 2 users SAP* and DDIC. Transport configurations are always done from 000 client. (they can t be done in any other client and they have to be done with the user DDIC).
Other client like Customizing client, testing client etc are created form the 000 client. Similarly in the production environment also the productive environment client is copied from 000.
001: SAP standard client
This client is used to set up new "neutral " clients by client copy.
This is also an SAP reference client. No changes should be done in this client either
Do not change or delete client 000 or client 001.
Regards,
Prashant

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