It's officially unofficial - DBCC PAGE

If you search for information about the DBCC PAGE command, the only Microsoft official document you'll find refers to a SQL Server version older than v7. One blog post I found was from Paul Randall of the SQL Server Storage Engine Team which explains how to use DBCC PAGE in conjunction to using DBCC CHECKDB. DBCC PAGE is used to obtain the data that is contained in a SQL Server page structure. Before you can really take advantage of this tool, you need to run the DBCC TRACEON(3604).