<s>
XBill	B-Application
is	O
an	O
arcade	O
style	O
game	O
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
The	O
goal	O
is	O
to	O
prevent	O
Bill	O
's	O
legions	O
of	O
clones	O
from	O
installing	O
"	O
Wingdows	O
"	O
,	O
a	O
virus	O
"	O
cleverly	O
designed	O
to	O
resemble	O
a	O
popular	O
operating	B-General_Concept
system	I-General_Concept
"	O
(	O
a	O
parody	O
of	O
Windows	B-Application
)	O
,	O
on	O
a	O
variety	O
of	O
computers	O
running	O
other	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
It	O
was	O
very	O
popular	O
among	O
Linux	B-Application
gamers	O
at	O
the	O
end	O
of	O
the	O
1990s	O
,	O
beating	O
out	O
Quake	B-Application
,	O
though	O
not	O
Quake	B-Application
II	I-Application
,	O
as	O
Linux	B-Application
Journal	O
reader	O
's	O
favourite	O
Linux	B-Application
game	O
in	O
1999	O
.	O
</s>
<s>
The	O
operating	B-General_Concept
systems	I-General_Concept
are	O
represented	O
by	O
logos	O
shown	O
on	O
the	O
computer	O
screens	O
.	O
</s>
<s>
The	O
computers	O
the	O
player	O
must	O
defend	O
include	O
PCs	B-Device
running	O
Linux	B-Application
and	O
BSD	B-Operating_System
,	O
SPARCstations	B-Device
with	O
Solaris	B-Application
,	O
SGI	B-Operating_System
IRIX	I-Operating_System
workstations	O
,	O
Apple	B-Device
Macintosh	I-Device
,	O
PalmPilots	B-Device
,	O
and	O
NeXTcubes	B-Device
.	O
</s>
<s>
When	O
Bill	O
installs	O
Wingdows	O
onto	O
a	O
computer	O
,	O
its	O
current	O
operating	B-General_Concept
system	I-General_Concept
is	O
placed	O
beside	O
it	O
.	O
</s>
<s>
Using	O
the	O
mouse	B-Device
,	O
the	O
player	O
must	O
squash	O
Bill	O
and	O
drag	O
discarded	O
operating	B-General_Concept
systems	I-General_Concept
back	O
to	O
their	O
computers	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
the	O
level	O
,	O
points	O
are	O
accrued	O
for	O
every	O
computer	O
that	O
is	O
still	O
running	O
its	O
original	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
On	O
later	O
levels	O
,	O
computers	O
are	O
connected	O
to	O
each	O
other	O
with	O
LAN	B-General_Concept
cables	O
,	O
causing	O
Wingdows	O
to	O
spread	O
faster	O
.	O
</s>
<s>
Originally	O
written	O
in	O
C++	B-Language
,	O
the	O
code	O
base	O
was	O
later	O
with	O
version	O
2.1	O
refactored	O
to	O
C	B-Language
.	O
</s>
<s>
The	O
game	O
was	O
later	O
in	O
the	O
end	O
1990s	O
,	O
deliberately	O
ported	O
to	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Ports	O
to	O
many	O
other	O
platforms	O
as	O
Mac	B-Application
OS	I-Application
X	I-Application
,	O
Openmoko	B-Application
,	O
Android	B-Application
,	O
and	O
Maemo	B-Operating_System
phones	O
followed	O
due	O
to	O
its	O
open	O
source	O
nature	O
.	O
</s>
<s>
In	O
2009	O
,	O
the	O
project	O
was	O
resurrected	O
as	O
XBill-NG	O
,	O
similar	O
in	O
concept	O
to	O
Lincity-NG	B-Application
.	O
</s>
<s>
XBill	B-Application
was	O
very	O
popular	O
among	O
Linux	B-Application
gamers	O
at	O
the	O
end	O
of	O
the	O
1990s	O
,	O
beating	O
out	O
Quake	B-Application
,	O
though	O
not	O
Quake	B-Application
II	I-Application
,	O
as	O
Linux	B-Application
Journal	O
readers	O
 '	O
favourite	O
Linux	B-Application
game	O
in	O
1999	O
.	O
</s>
<s>
The	O
game	O
holds	O
four	O
out	O
of	O
five	O
stars	O
on	O
the	O
Linux	B-Application
Game	O
Tome	O
and	O
was	O
noted	O
by	O
DesktopLinux.com	O
.	O
</s>
<s>
Despite	O
its	O
status	O
,	O
it	O
is	O
not	O
always	O
packaged	O
with	O
Linux	B-Application
distributions	I-Application
due	O
to	O
its	O
"	O
disparaging	O
"	O
content	O
:	O
for	O
instance	O
Fedora	O
does	O
not	O
integrate	O
it	O
while	O
Debian	O
does	O
.	O
</s>
<s>
Somewhat	O
illustrating	O
its	O
notoriety	O
,	O
graphics	O
from	O
the	O
game	O
are	O
used	O
on	O
the	O
website	O
of	O
the	O
2009	O
Free	B-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
campaign	O
Windows	B-Application
7	I-Application
Sins	I-Application
.	O
</s>
