I am developing a program where 99% of the time i can use a set Grammar in the standard Microsoft Speech Recognition to detect words being said. However in a few circumstanc
There is a class called DictationGrammar that allows you to recognize dictated speech.
It also supports a "dictation context" - so you can specify that the dictated text should start/end with a specific phrase.
I think that would do the trick - technically, it's still a grammar, but it seems to fit what you're looking for.