<s>
Emacspeak	B-Language
is	O
a	O
free	B-Application
computer	O
application	O
,	O
a	O
speech	O
interface	O
,	O
and	O
an	O
audio	O
desktop	O
(	O
as	O
opposed	O
to	O
a	O
screen	O
reader	O
)	O
.	O
</s>
<s>
It	O
employs	O
Emacs	B-Application
(	O
which	O
is	O
written	O
in	O
C	B-Language
)	O
,	O
Emacs	B-Operating_System
Lisp	I-Operating_System
,	O
and	O
Tcl	B-Operating_System
.	O
</s>
<s>
It	O
is	O
portable	O
to	O
all	O
POSIX-compatible	O
OSs	B-General_Concept
.	O
</s>
<s>
It	O
is	O
tightly	O
integrated	O
with	O
Emacs	B-Application
,	O
allowing	O
it	O
to	O
render	O
intelligible	O
and	O
useful	O
content	O
rather	O
than	O
parsing	O
the	O
graphics	O
(	O
hence	O
it	O
is	O
sometimes	O
referred	O
to	O
not	O
as	O
a	O
separate	O
program	O
,	O
but	O
a	O
subsystem	O
of	O
Emacs	B-Application
)	O
;	O
its	O
default	O
voice	B-Application
synthesizer	I-Application
(	O
as	O
of	O
2002	O
,	O
IBM	O
's	O
ViaVoice	B-Application
Text-to-Speech	I-Application
(	O
TTS	O
)	O
)	O
can	O
be	O
replaced	O
with	O
other	O
software	O
synthesizers	O
when	O
a	O
server	O
module	O
is	O
installed	O
.	O
</s>
<s>
Emacspeak	B-Language
is	O
one	O
of	O
the	O
most	O
popular	O
speech	O
interfaces	O
for	O
Linux	O
,	O
bundled	O
with	O
most	O
major	O
distributions	O
.	O
</s>
<s>
Emacspeak	B-Language
achieves	O
its	O
integration	O
by	O
being	O
written	O
largely	O
in	O
Emacs	B-Operating_System
Lisp	I-Operating_System
using	O
"	B-Application
advice	I-Application
"	I-Application
,	O
enabling	O
it	O
to	O
literally	O
be	O
a	O
wrapper	O
around	O
most	O
functions	O
that	O
change	O
or	O
otherwise	O
modify	O
the	O
display	O
.	O
</s>
<s>
Emacspeak	B-Language
facilitates	O
access	O
to	O
a	O
wide	O
variety	O
of	O
content	O
,	O
from	O
the	O
web	O
to	O
DAISY	O
books	O
.	O
</s>
<s>
On	O
Monday	O
,	O
April	O
12	O
,	O
1999	O
,	O
Emacspeak	B-Language
became	O
part	O
of	O
the	O
Smithsonian	O
Museum	O
's	O
Permanent	O
Research	O
Collection	O
on	O
Information	O
Technology	O
at	O
the	O
Smithsonian	O
's	O
National	O
Museum	O
of	O
American	O
History	O
.	O
</s>
<s>
As	O
of	O
January	O
10	O
,	O
2023	O
,	O
Emacspeak	B-Language
is	O
at	O
version	O
57	O
.	O
</s>
