While using SQL Server Profiler to monitor my SQL Server database recently, I periodically received the message Error: 602, Severity: 21, State: 13. In the Process Info window in Enterprise Manager, I found an entry that displayed a background process called GHOST CLEANUP; the user system had initiated this command. I used DBCC CHECKDB to check my database for problems, but I found no anomalies. What is the GHOST CLEANUP command, and what is error 602?