Help with SAPI....Please

I am making a VUI system using Microsoft's SAPI 5.1. I was wondering if someone could help me with a few problems I am having.

I need some way to limit the amount of memory the Audio input can take, after it reaches that limit truncate and process what ever is left. I do 'grammar.dictationload' so how can I limit the length of the sentences the user says.........or atleaste let them clear the buffer. Basicly my program has trouble when the user starts to speak continusly with out stoping; if they do, it gets backlogged for about 10-15 seconds while it processes the stuff in the Audio Input.

How can I have my program bring up the Microsoft Speech Training program?

P.S Please Email me with any help you can give: [email protected]

Thanks,
DarkEyes