DLL Imports
A final place to check for undocumented features is the SQL Server executable's import table. Every Windows executable has an import table. For each of the DLLs that the executable requires to load, this table lists the functions that it has explicitly referenced. By examining this table, you can learn about undocumented functions the executable may be calling. Once you have a function name, you can use a debugger to set a breakpoint and see when it's called.
A good example of this is the OPENDS60.DLL that ships with SQL Server. This DLL implements the Open Data Services API that the server uses internally and that is used to construct extended procedures. If you look at the import table for sqlservr.exe, the SQL Server executable, ...
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