MyNodes.net questions

[titusece]

Dear All,
I'm very new to this MyNodes.net, want to clarify some questions.
Where I can find detailed documentation for MyNodes.net development ?
http://www.mynodes.net/Develop/UiNode
http://www.mynodes.net/Develop/Node

How can we use MQTT in MyNodes.net ?
Can we use any native C code in MyNodes.net ?
Suppose if I have C stack code, can I use that stack as API or need to port that complete stack into MyNodes.net ?
If I want to add new nodes , how can I do that ?
I've referred the above documentation but not clear how can we build it on Linux (Building MyNodes.net source code on Ubuntu Linux) ?

Thanks for answering my questions.

Regards,
Titus S.