Here's what I know: If you port forward, you will have external access, I specified port 82 as my web interface, port 5002 for my mobile interface, and port 7890 for my dev interface. I just opened the port on my router and pointed to the ip address of my dvr (not-dhcp).
I was able to get Meye (android) working by following the conversation on here:
http://www.justanswer.com/computer/6s0gu-cannot-view-security-cctv-dvr-android-smartphone-dvr.html
However, I'd still like to get a better way to access the streams so I don't need special software. Is there a http://mydvr/mobile.aspx or light.aspx or something like that? As I said, I have no manual, so I don't know what this thing offers.