title: How to detect when SAPI TTS engine is busy
body: <p>The SAPI engine can only render TTS from one application at a time (I have run a test with two instances of the Windows SDK TTSApplication sample to verify this). I am writing an application in which I need to detect whether the TTS engine is currently speaking (i.e. under control of a separate application, not mine).</p>
  
  <p>Does anyone know please how can I programmatically (in C++) detect the SAPI TTS engine busy/ready state? I have tried using ISpVoice::GetStatus() but that only seems to work for any TTS activity in my own application.</p>
  
  <p>Thanks.</p>