I suspect they are using the mac speech synthesis manager method called 
SpeakString

http://developer.apple.com/documentation/Carbon/Reference/Speech_Synthesis_Manager/Reference/reference.html#//apple_ref/c/func/SpeakString

I can try to find out if you really want to know.

BTW, I heard there are some bugs in the say command. For example try doing

say bullfrog
say bullfrogs

It gets the singular and plural switched around.

CB

E.J. Zufelt wrote:
> Good afternoon,
>
> I wonder if AIM is doing this through the API, or through the system 
> Say command.
>
>
> Everett
>
> Follow me on Twitter
> http://twitter.com/ezufelt
>
> View my LinkedIn Profile
> http://www.linkedin.com/in/ezufelt
>
>
>
>
>
> On 13-Apr-09, at 1:04 PM, Chris Blouch wrote:
>
>> Hmm. The AOL AIM client speaks incoming text if you turn that option 
>> on in preferences so I would suspect any application can do it. The 
>> only limitation of the VO APIs I know of is that you can't detect if 
>> VO is on or not which is probably a nod to Apple's Universal Design 
>> philosophy.
>>
>> CB
>>
>> E.J. Zufelt wrote:
>>> Good afternoon,
>>>
>>> I believe, from what I have read about Firefox accessibility  
>>> challenges, that implementing aria live region support in any browser  
>>> will require changes to be made to the Apple accessibility API.  There  
>>> is currently no way for applications to "alert" the OS that something  
>>> needs to be spoken.  Maybe in Snow Leopard, not holding my breath.
>>>
>>> This change might  also make it possible to tweak the accessibility  
>>> problems of some applications.  Imagine if instant message clients  
>>> could automatically read messages that are posted or allow users to  
>>> easily read back through the message log with a keystroke.
>>>
>>> HTH,
>>> Everett
>>>
>>> Follow me on Twitter
>>> http://twitter.com/ezufelt
>>>
>>> View my LinkedIn Profile
>>> http://www.linkedin.com/in/ezufelt
>>>
>>>
>>>
>>>
>>>
>>> On 13-Apr-09, at 12:52 PM, Chris Blouch wrote:
>>>
>>>   
>>>> The main thing I'm looking for in an ARIA enabled browser is support  
>>>> for
>>>> live regions. This is where a spot on the page is set up such that any
>>>> changes to that spot are automatically announced. This is a great  
>>>> way to
>>>> implement web-based chat, stock tickers and other real-time data  
>>>> feeds.
>>>> Unfortunately it appears that Safari 4 Beta does not yet support live
>>>> regions.
>>>>
>>>> CB
>>>>
>>>> E.J. Zufelt wrote:
>>>>     
>>>>> Good morning,
>>>>>
>>>>> Just briefly tested http://search.yahoo.com/ with Safari 4 beta's  
>>>>> ARIA
>>>>> support.  I didn't spend much time on the site, but the search
>>>>> suggestions were accessible.
>>>>>
>>>>> 1. Go to the site
>>>>>
>>>>> 2. Navigate to the search field
>>>>>
>>>>> 3. Type in part of a search query
>>>>>
>>>>> 4. Use VO + Up and Down arrows to read through the suggestions.
>>>>>
>>>>> I'd lov to hear others' experiences.
>>>>>
>>>>> Thanks,
>>>>> Everett
>>>>>
>>>>> Follow me on Twitter
>>>>> http://twitter.com/ezufelt
>>>>>
>>>>> View my LinkedIn Profile
>>>>> http://www.linkedin.com/in/ezufelt
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>       
>>>>     
>>>
>>>
>>>   
>>
>>
>>
>
>
> >

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