DBCC TRACEON (3605,1204,-1)

Hi I am having deadlock issues and have been reading articals on ee as to how to trace my deadlocks. I have seen the command DBCC TRACEON (3605,1204,-1), can anyone tell me what I do with this? I assume I paste into query analyser but how do I or indeed is there an output to reveiw? Also do I need to switch it off again? in short and as only one question can someone tell me how to use this command? Thanks Solution: DBCC TRACEON (3605,1204,-1) I have used the information from the following link to trace deadlocks. http://www.sqlservercentral.com/articles/Performance+Tuning+and+Scaling/tracingdeadlocks/1324/