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Documentation is also available in separate downloads.
SQL Server ships with special system stored procedures that have been written by the SQL Server development team, but you can also write your own stored procedures. You can see the code behind any system stored procedure from the Enterprise Manager. The extended stored procedures that ship with SQL Server are basically a special type of system stored procedure, but you can also write your own extended stored procedures. For a complete listing of extended stored procedures expand the Extended Stored Procedures option in the master database. I discuss how to do this in my book.