So the question I had was just what is this Natlink? I have installed it and it seems to work well but just what is it?
I found this amongst the messages on SpeechComputing.com:
NatLink is an platform built on top of DNS that allows writing extremely powerful voice commands (more powerful than what you can do with Advanced Scripting) by writing entire Python programs. Pretty much unusable directly unless you’re a programmer.
Building on top of NatLink are:
Vocola 2: implements a very simple and concise language for writing voice commands that handles 95% of the commands you might want.
Unimacro: a series of ready to use powerful grammars for things like switching tasks, opening folders, and editing lines.
Dragonfly: a higher level, more object-oriented interface for NatLink. Somewhat usable by nonprogrammers using cut-and-paste programming.
Both Vocola and dragonfly can be used with Windows speech recognition as well. There is a somewhat dated comparison between Vocola 2 and Unimacro at
that you may find useful. Note that you can call Unimacro actions from Vocola 2 if you have both installed.