<s>
A	O
light	B-Device
gun	I-Device
is	O
a	O
pointing	B-Device
device	I-Device
for	O
computers	O
and	O
a	O
control	B-Device
device	I-Device
for	O
arcade	O
and	O
video	B-Device
games	I-Device
,	O
typically	O
shaped	O
to	O
resemble	O
a	O
pistol	O
.	O
</s>
<s>
The	O
first	O
light	B-Device
guns	I-Device
were	O
produced	O
in	O
the	O
1930s	O
,	O
following	O
the	O
development	O
of	O
light-sensing	O
vacuum	O
tubes	O
.	O
</s>
<s>
Sega	O
's	O
1969	O
game	O
Missile	O
features	O
electronic	O
sound	O
and	O
a	O
moving	O
film	O
strip	O
to	O
represent	O
the	O
targets	O
on	O
a	O
projection	O
screen	O
,	O
and	O
its	O
1972	O
game	O
Killer	O
Shark	O
features	O
a	O
mounted	O
light	B-Device
gun	I-Device
with	O
targets	O
whose	O
movement	O
and	O
reactions	O
are	O
displayed	O
using	O
back	O
image	B-Application
projection	I-Application
onto	O
a	O
screen	O
.	O
</s>
<s>
Nintendo	O
released	O
the	O
Beam	O
Gun	O
in	O
1970	O
and	O
the	O
Laser	B-Application
Clay	I-Application
Shooting	I-Application
System	I-Application
in	O
1973	O
,	O
followed	O
in	O
1974	O
by	O
the	O
arcade	O
game	O
Wild	B-Application
Gunman	I-Application
,	O
which	O
uses	O
film	B-Application
projection	I-Application
to	O
display	O
the	O
target	O
on	O
the	O
screen	O
.	O
</s>
<s>
In	O
1975	O
,	O
Sega	O
released	O
the	O
early	O
co-operative	O
light	B-Device
gun	I-Device
shooters	O
Balloon	O
Gun	O
and	O
Bullet	O
Mark	O
.	O
</s>
<s>
The	O
first	O
detection	O
method	O
,	O
used	O
by	O
the	O
NES	B-Device
Zapper	I-Device
,	O
involves	O
drawing	O
each	O
target	O
sequentially	O
in	O
white	O
light	O
after	O
the	O
screen	O
blacks	O
out	O
.	O
</s>
<s>
The	O
Wii	B-Device
Remote	I-Device
uses	O
an	O
infrared	O
video	O
camera	O
in	O
the	O
handheld	O
controller	O
,	O
rather	O
than	O
a	O
simple	O
sensor	O
.	O
</s>
<s>
Wesley	O
Yin-Poole	O
stated	O
that	O
the	O
Wii	B-Device
Remote	I-Device
was	O
not	O
as	O
accurate	O
as	O
a	O
traditional	O
light	B-Device
gun	I-Device
.	O
</s>
<s>
GunCon	B-Device
3	I-Device
is	O
an	O
infrared	O
gun	O
.	O
</s>
<s>
By	O
determining	O
the	O
size	O
and	O
distortion	O
of	O
the	O
rectangle	O
outline	O
of	O
the	O
screen	O
,	O
it	O
is	O
possible	O
to	O
calculate	O
where	O
exactly	O
the	O
light	B-Device
gun	I-Device
is	O
pointing	O
.	O
</s>
<s>
This	O
method	O
was	O
introduced	O
by	O
the	O
Sinden	O
Lightgun	B-Device
.	O
</s>
<s>
The	O
positional	O
gun	O
is	O
common	O
in	O
video	O
arcades	O
,	O
as	O
a	O
non-optical	O
alternative	O
to	O
a	O
light	B-Device
gun	I-Device
.	O
</s>
<s>
The	O
positional	O
gun	O
is	O
permanently	O
mounted	O
on	O
a	O
swivel	O
on	O
the	O
cabinet	O
,	O
as	O
an	O
analog	B-Device
joystick	I-Device
for	O
aiming	O
crosshairs	O
onscreen	O
.	O
</s>
<s>
Positional	O
gun	O
games	O
include	O
Silent	B-Device
Scope	I-Device
,	O
the	O
arcade	O
version	O
of	O
Resident	B-Application
Evil	I-Application
Survivor	I-Application
2	I-Application
,	O
Space	B-Application
Gun	I-Application
,	O
Revolution	B-Application
X	I-Application
,	O
and	O
Terminator	B-Application
2	I-Application
:	I-Application
Judgment	I-Application
Day	I-Application
.	O
</s>
<s>
Console	B-Device
conversions	O
may	O
use	O
light	B-Device
guns	I-Device
.	O
</s>
<s>
A	O
positional	O
gun	O
is	O
essentially	O
an	O
analog	B-Device
joystick	I-Device
that	O
records	O
the	O
position	O
of	O
the	O
gun	O
to	O
determine	O
the	O
player	O
's	O
aim	O
on	O
the	O
screen	O
.	O
</s>
<s>
Qwak	B-Application
!	I-Application
</s>
