12 string tuning

This is a 2.29 minute video response from Jim Deeming on Nov 1st, 2008

Question:

"Xandy66 asks, "I just getting back to playing, it has been a while! How do I tune a 12 string? I saw one video on the site that said to tune 1 step down. DGCFAD not the usual EADGFE. Can I use my Guitar tuner, a Fender AG-6?""