<s>
Sentient	B-General_Concept
computing	I-General_Concept
is	O
a	O
form	O
of	O
ubiquitous	B-Architecture
computing	I-Architecture
which	O
uses	O
sensors	O
to	O
perceive	O
its	O
environment	O
and	O
react	O
accordingly	O
.	O
</s>
<s>
One	O
famous	O
research	O
prototype	O
of	O
a	O
sentient	B-General_Concept
computing	I-General_Concept
system	O
was	O
the	O
work	O
at	O
AT&T	O
Laboratories	O
,	O
Cambridge	O
(	O
now	O
defunct	O
)	O
.	O
</s>
<s>
It	O
consisted	O
of	O
an	O
ultrasonic	B-Algorithm
indoor	O
location	O
system	O
called	O
the	O
"	O
Active	O
Bats	O
"	O
which	O
provided	O
a	O
location	O
accuracy	O
of	O
about	O
3cm	O
.	O
</s>
<s>
The	O
world	O
model	O
was	O
managed	O
via	O
the	O
database	O
,	O
using	O
CORBA	B-Architecture
to	O
access	O
information	O
and	O
spatial	O
indexing	O
to	O
deliver	O
high-level	O
events	O
such	O
as	O
"	O
Alice	O
has	O
entered	O
the	O
kitchen	O
"	O
to	O
listening	O
context-aware	O
applications	O
.	O
</s>
<s>
Teleporting	O
desktops	O
via	O
VNC	B-Protocol
just	O
by	O
clicking	O
their	O
Active	O
Bat	O
near	O
the	O
computer	O
.	O
</s>
