[Accessibility] AT Device Shared I/O

Mario Lang mlang at delysid.org
Sat Sep 6 05:36:35 PDT 2003

Janina Sajka <janina at rednote.net> writes:

> 2.) AT device Shared I/O
> It should be possible for devices commonly used by persons with disabilities
> to operate smoothly with several client applications. We need to
> adopt or develop libraries that allow client applications to share
> these I/O devices. Shared access to accessibility related devices
> such as Braille displays, reduces the cost of ownership and improves
> the user experience.
> In some circumstances it will be necessary to support simultaneous
> access for different client applications, e.g. to allow a
> software-based speech synthesizer to speak while a multi-media
> stream is playing rather than queueing its messages to play after
> the stream concludes. In other circumstances it will be necessary to
> have messages queue

or supress

> until a particular Window (or Console) has focus.

These libraries should offer a generic high-level abstraction of
the underlying device to allow client applications to use them independently
of the actual hardware in use.  This will simplify the development of
accessibility related software by sharing commonly used code such as low-level
driver implementations in such libraries.


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