Quote Originally Posted by szlamany
It still runs as a service when you open it in the connection string - SQLSERVER.EXE still runs and listens on it's ports as if the DB was permanently attached.

I've not fooled with it but I'm guessing you can several users connect to the DB even if they "connect/attach" in the connection string.
I read the documentation, and you are right, it still connects to the SQL Server Express service.

Thanks for correcting my mistake