Keep in mind, US sanctions against North Korea mean key technologies make it difficult to import computers. Although these days there's so many ways to get mobile devices that might be a moot point.
Last year we were in South Korea and we went on one of the popular "DMZ Tours". So, on the tour you go to Dorason Station, which is the jumping off point from South Korea onto the rail line into North Korea, and then after that you go up a hill and look into North Korea. From that overlook, you can see Kaesong, which I think is about 7 miles over the border or so.
My guess is that this is going to be a simple and highly restricted system. A lot of management is from South Korea, so they'll give them access. From there, the simplest way would be a straight wireless shot to South Korea, but maybe N. Korea can make a play to get their paws on the traffic.
Interesting factoid, North Korea's official GDP (not counting it's counterfeit currency, drug and arms trade) is about $12 billion. Of that, $2 billion comes from trade generated by Kaesong. So when North Korea cut off access to Kaesong, it effectively made the decision to shut down 17% of its economy overnight.