Least anyone feels that it is my own expertise, let me forcefully point out that I found this gem of information by reading a blog posting by Kimberly L. Tripp (link included in the justification for the correct answer).

I hope that this question introduces many to use all the resources available to them, SqlServerCentral, Books On Line, among the obvious and the not so obvious, blog postings of many highly qualified individuals to delve deeper into the inner workings of SQL Server.