<s>
A	O
surface	B-Device
computer	I-Device
is	O
a	O
computer	O
that	O
interacts	O
with	O
the	O
user	O
through	O
the	O
surface	B-Device
of	O
an	O
ordinary	O
object	O
,	O
rather	O
than	O
through	O
a	O
monitor	B-Device
,	O
keyboard	B-Device
,	O
mouse	B-Device
,	O
or	O
other	O
physical	O
hardware	B-Architecture
.	O
</s>
<s>
The	O
term	O
"	O
surface	B-Device
computer	I-Device
"	O
was	O
first	O
adopted	O
by	O
Microsoft	O
for	O
its	O
PixelSense	B-General_Concept
(	O
codenamed	O
Milan	O
)	O
interactive	O
platform	O
,	O
which	O
was	O
publicly	O
announced	O
on	O
30	O
May	O
2007	O
.	O
</s>
<s>
Featuring	O
a	O
horizontally-mounted	O
30-inch	O
display	O
in	O
a	O
coffee	O
table-like	O
enclosure	O
,	O
users	O
can	O
interact	O
with	O
the	O
machine	O
's	O
graphical	B-Application
user	I-Application
interface	I-Application
by	O
touching	B-Application
or	I-Application
dragging	I-Application
their	O
fingertips	O
and	O
other	O
physical	O
objects	O
such	O
as	O
paintbrushes	B-Language
across	O
the	O
screen	O
,	O
or	O
by	O
setting	O
real-world	O
items	O
tagged	O
with	O
special	O
bar-code	O
labels	O
on	O
top	O
of	O
it	O
.	O
</s>
<s>
a	O
Bluetooth-enabled	O
digital	B-Device
camera	I-Device
)	O
to	O
be	O
placed	O
on	O
the	O
unit	O
's	O
display	O
.	O
</s>
<s>
PixelSense	B-General_Concept
's	O
internal	O
hardware	B-Architecture
includes	O
a	O
2.0GHz	O
Core	O
2	O
Duo	O
processor	O
,	O
2GB	O
of	O
memory	O
,	O
an	O
off	O
the	O
shelf	O
graphics	B-Device
card	I-Device
,	O
a	O
scratch-proof	O
spill-proof	O
surface	B-Device
,	O
a	O
DLP	B-General_Concept
projector	I-General_Concept
,	O
and	O
five	O
infrared	O
cameras	O
to	O
detect	O
touch	O
,	O
unlike	O
the	O
iPhone	B-Device
,	O
which	O
uses	O
a	O
capacitive	O
display	O
.	O
</s>
<s>
These	O
expensive	O
components	O
resulted	O
in	O
a	O
price	O
tag	O
of	O
between	O
$	O
12,500	O
to	O
$	O
15,000	O
for	O
the	O
hardware	B-Architecture
.	O
</s>
<s>
The	O
first	O
PixelSense	B-General_Concept
units	O
were	O
used	O
as	O
information	O
kiosks	O
in	O
the	O
Harrah	O
's	O
family	O
of	O
casinos	O
.	O
</s>
<s>
These	O
products	O
were	O
originally	O
branded	O
as	O
"	O
Microsoft	B-Device
Surface	I-Device
"	O
,	O
but	O
was	O
renamed	O
"	O
Microsoft	B-General_Concept
PixelSense	I-General_Concept
"	O
on	O
June	O
18	O
,	O
2012	O
,	O
after	O
the	O
manufacturer	O
adopted	O
the	O
"	O
Surface	B-Device
"	O
name	O
for	O
its	O
new	O
series	O
of	O
tablet	B-Device
PCs	I-Device
.	O
</s>
