Whats the functional difference between user IDs SAP* and DDIC?

Whats the functional difference between SAP* and DDIC? Can any one tell me please. I am new here. Thanks in advance.

Hi Farooq,
There are three user IDs in various SAP clients.
1. SAP* (Client 000 and 001)
SAP* denotes the default super user and has all administrative powers.
2. DDIC (Client 000 and 001)
DDIC user is responsible for the maintenance of the ABAP/4 Dictionary and the software logistics.
3. EarlyWatch (Client 066)
The EarlyWatch user has access only to monitoring and performance data.
Please check this link for more information on data dictionary objects.
http://help.sap.com/saphelp_webas620/helpdata/en/cf/21ea31446011d189700000e8322d00/content.htm
Hope this will help.
Regards,
Ferry Lianto

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