SuperDrive and changing region encoding

I am going on a trip to New Zealand for a few months (business training) and am looking for a new laptop to take with. I am planning to take along DVDs I already own, but would like to be able to watch DVDs I pick up locally as well.
I know that some drives can be swapped back and forth between regions a set number of times before they "stick" on one. My questions are:
1) Can the Super Drive play DVDs from both region 1 (US) and region 4 (NZ, among other places)?
2) If it needs to switch between them when I put one from region 1 and then region 4, is there a limit to the number of switches allowed?
3) Is there software that can aid in this effort? (I realize that last question skirts the boundary of legality, and I am an attorney, so it needs to be legal.)
Thanks in advance for any advice.

I am considering switching my primary laptop to one of the new MacBook Airs but, as a frequent traveler, also need to find a region free DVD solution. This is for my personal use--nothing illegal--but the greater difficulty of getting around region settings on Macs (as compared to PCs) is one of the main factors that has kept me from making the leap.
Any thoughts are appreciated.
Thanks,
Ben

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