Session Settings

How to find, compare and use the exact same session settings as another user in SQL Server

When diagnosing issues in SQL Server I've found that sometimes I need to be able to mimic a user's session state when attempting to repeat an error they may be receiving. The smallest differences can completely change the outcome, so I need to ensure all the session settings (QUOTED_IDENTIFIER, ANSI_NULLS, and so forth) are identical between the production session and my test session. Is there an easy way to determine these settings with a single query?