it says....
"To play a DVD, the region code of the DVD must match the region code of your DVD drive. Your DVD drive is automatically set to a region code the first time you play a coded DVD. If the region code for a DVD does not match the current region code of your DVD drive, a dialog appears for you to change the code for the drive."
I am unable to test this as I don't have a any DVD's that I've ever had problems with.
Also, you must be aware of the Warning:
IMPORTANT:You can set the region code for your DVD drive only five times (including the original setting). The fifth time you change the code, it will be permanently set.
Anyway, maybe someone with a DVD from a different region (?) will come along and answer this for you.