sp_cursorprepexec is a built-in stored procedure that comes with SQL Server. Details here: http://msdn.microsoft.com/en-us/library/ff848775.aspx
But it looks like it's in a comment-block in the code you quoted. /* begins a comment, and */ ends it. This is called a "c-style comment block", because it comes from the C programming language. T-SQL uses it the same way. That means what you quoted is probably just being called into that. Not entirely sure, since I don't use sp_cursorprepexec in my own programs.
But it's definitely just a call to a cursor, either way, as per MSDN.
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