<s>
XPilot	B-Language
is	O
a	O
multiplayer	O
video	O
game	O
.	O
</s>
<s>
It	O
is	O
open	B-Application
source	I-Application
and	O
runs	O
on	O
many	O
platforms	O
.	O
</s>
<s>
Although	O
its	O
2D	O
graphics	O
have	O
improved	O
over	O
time	O
,	O
they	O
still	O
resemble	O
the	O
style	O
of	O
Thrust	B-Application
.	O
</s>
<s>
Gameplay	O
includes	O
Capture	B-Application
the	I-Application
Flag	I-Application
,	O
base	O
defense	O
,	O
racing	O
and	O
deathmatches	O
.	O
</s>
<s>
XPilot	B-Language
uses	O
a	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
architecture	I-Operating_System
,	O
in	O
which	O
a	O
central	O
metaserver	B-Application
receives	O
information	O
from	O
all	O
XPilot	B-Language
servers	O
on	O
the	O
Internet	O
.	O
</s>
<s>
In	O
1991	O
,	O
Bjørn	O
Stabell	O
and	O
Ken	O
Schouten	O
,	O
then	O
computer	B-General_Concept
science	I-General_Concept
undergraduates	O
at	O
the	O
University	O
of	O
Tromsø	O
,	O
began	O
writing	O
XPilot	B-Language
,	O
inspired	O
by	O
the	O
earlier	O
game	O
Thrust	B-Application
.	O
</s>
<s>
It	O
was	O
originally	O
developed	O
in	O
C	B-Language
on	O
HP9000	B-Device
workstations	B-Device
which	O
ran	O
Unix	B-Application
.	O
</s>
<s>
Other	O
XPilot	B-Language
users	O
wrote	O
documentation	O
and	O
contributed	O
source	O
code	O
to	O
the	O
project	O
.	O
</s>
<s>
By	O
1996	O
,	O
there	O
were	O
nearly	O
one	O
hundred	O
XPilot	B-Language
servers	O
worldwide	O
.	O
</s>
<s>
XPilot	B-Language
's	O
code	O
has	O
been	O
forked	O
several	O
times	O
.	O
</s>
<s>
XPilot5	O
is	O
a	O
complete	O
rewrite	O
of	O
XPilot	B-Language
in	O
C++	B-Language
.	O
</s>
<s>
In	O
late	O
2000	O
,	O
another	O
group	O
of	O
developers	O
began	O
a	O
branch	O
of	O
XPilot	B-Language
,	O
later	O
labeled	O
XPilot	B-Language
NG	O
(	O
for	O
next	O
generation	O
)	O
.	O
</s>
<s>
Programmed	O
in	O
C	B-Language
,	O
it	O
contains	O
two	O
clients	B-Protocol
,	O
either	O
X11-based	O
or	O
SDL/OpenGL	O
-based	O
.	O
</s>
<s>
Unlike	O
the	O
block-based	O
maps	O
of	O
the	O
original	O
game	O
,	O
XPilot	B-Language
NG	O
provides	O
high	O
frame	O
rates	O
and	O
polygon	B-General_Concept
maps	O
.	O
</s>
<s>
A	O
new	O
Java	B-Language
based	O
map	O
editor	O
provides	O
better	O
map	O
editing	O
facilities	O
.	O
</s>
<s>
The	O
latest	O
version	O
of	O
XPilot	B-Language
NG	O
is	O
4.7.2	O
.	O
</s>
<s>
In	O
2009	O
,	O
7b5	O
Labs	O
released	O
XPilot	B-Language
iPhone	B-Device
,	O
an	O
XPilot	B-Language
client	O
for	O
Apple	O
's	O
iPhone	B-Device
and	O
iPod	B-Device
Touch	I-Device
.	O
</s>
<s>
It	O
is	O
based	O
on	O
XPilot	B-Language
and	O
XPilot	B-Language
NG	O
and	O
uses	O
touchscreen	B-Device
controls	O
.	O
</s>
<s>
The	O
metaserver	B-Application
contains	O
a	O
list	O
of	O
all	O
XPilot	B-Language
maps	O
on	O
the	O
Internet	O
.	O
</s>
<s>
Team	O
games	O
may	O
also	O
be	O
run	O
in	O
a	O
slightly	O
different	O
Capture	B-Application
the	I-Application
flag	I-Application
mode	O
.	O
</s>
<s>
XPilots	B-Language
in-game	O
chat	B-Protocol
and	O
multiplayer	O
functionality	O
spawned	O
the	O
formation	O
of	O
a	O
community	O
.	O
</s>
<s>
Contact	O
between	O
players	O
was	O
facilitated	O
by	O
newsgroups	B-Application
such	O
as	O
alt.games.xpilot	O
and	O
later	O
rec.games.computer.xpilot	O
.	O
</s>
<s>
After	O
the	O
first	O
HTML	B-Language
and	O
image-rendering	O
web	B-Application
browsers	I-Application
were	O
introduced	O
,	O
members	O
of	O
the	O
community	O
developed	O
the	O
game	O
's	O
online	O
documentation	O
.	O
</s>
