SA user password for software which automatically installs sql 2005

I am testing a software which requires sql 2005 for storing the data. The sql 2005 database is automatically installed when I installed the software. During the software installation I didn't encounter any screen to configure the sql 2005 database so I am assuming the configuration is done by the software installer.

I can reset the password for the sa but theoretically it would stop the application from working. Can anyone push me in a direction by which I can access the database with a client.