I suppose you tolerate rape and murder.
Mental masturbation wherein meaningless questions are poorly answered.
1. Set up OpenVPN on the datacenter Linux server to act as your Battlefield endpoint (single IP + port).
2. Set up 2 VPN connections, one from each phone, to that box.
3. Set up a Linux box to act as a router at home. Use bluetooth or whatever to connect it to your mobile connections.
4. Follow the directions here http://www.lartc.org/autoloadb... on how to set up iptables rules as needed on both Linux boxes.
5. Modify the iptables rules as needed to your specific requirements.
6. Keep on modifying iptables. It will take days to work out all the kinks.
7. Verify that your latency problems still exist.
For instance, Neo4J is a scalable graph-based "nosql" DB with ACID.
The not-so-arbitrary line is quite clear: If it runs in kernel space, it's low level. If it runs in user space, it's high level. If you don't know what these terms mean, do some reading.
There is blurriness in systems like Minix 3, where the kernel dispatches quite a bit of work to user space services. But even then, the dependencies (code paths) make it clear what is the OS and what is not. There is no such blurriness in MSWord or fsck. The NT kernel has no dependencies MSWord. Similarly, the Linux kernel doesn't need any of the code in fsck to perform its work.