Networking :: Writing Network Manager Application ?

I try to understand the way the network-admin tool retrieve and set information about the network connections, and after reviewing thee code, I still dont undertsnad how it does it. I thought that it should use maybe linux commands such as iwconfig or ifconfig or by using ioctl for get/set the parameters of the wireless, but I did not find such things in the code. It also does not use AT commands for modem devices parameters.

I see that it uses liboobs files, but after veiwing the code, I still don't understand how it works.

These question comes since I work on application which connects to wireless devices (possibly several wifi and modems devices can be connected ), and I try to think how to set/get the network parameters, I thought that a good start will be to look at how network-admin works.