> *Before* starting the assistant itself, you should check if the needed
> extensions are present and loaded and if a camera and/or audio device is
> present.  If these are NOT true, it's useless to start the assistant so
> you should show an error box with a usefull message as in "how to fix
> this" (only about the present problem, don't talk about "missing cam or
> extension", just say "this is missing, this is what you should do",
> eventually with a link to a page on the wiki. 

Well, if no webcam is present, the user might still want to run the audio 
wizard, for example. So yes, it's useless to run the webcam wizard, but 
the user can skip it and just configure audio.

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