<s>
GGPO	B-Application
(	O
Good	O
Game	O
Peace	O
Out	O
)	O
is	O
middleware	B-General_Concept
designed	O
to	O
help	O
create	O
a	O
near-lagless	O
online	O
experience	O
for	O
various	O
emulated	O
arcade	O
games	O
and	O
fighting	O
games	O
.	O
</s>
<s>
Before	O
its	O
creation	O
,	O
GGPO	B-Application
creator	O
Tony	O
Cannon	O
was	O
completely	O
dissatisfied	O
with	O
the	O
2006	O
Xbox	B-Operating_System
360	I-Operating_System
re-release	O
of	O
Street	B-Application
Fighter	I-Application
II	I-Application
:	I-Application
Hyper	I-Application
Fighting	I-Application
after	O
experiencing	O
its	O
criticized	O
online	O
capabilities	O
.	O
</s>
<s>
As	O
a	O
reaction	O
to	O
its	O
service	O
,	O
Cannon	O
began	O
development	O
on	O
GGPO	B-Application
and	O
released	O
the	O
first	O
version	O
in	O
late	O
2006	O
.	O
</s>
<s>
Cannon	O
later	O
demonstrated	O
GGPO	B-Application
to	O
Capcom	O
,	O
and	O
it	O
was	O
positively	O
received	O
.	O
</s>
<s>
The	O
downloadable	O
GGPO	B-Application
client	O
supported	O
many	O
games	O
from	O
Capcom	O
and	O
SNK	O
,	O
including	O
Super	B-Application
Street	I-Application
Fighter	I-Application
II	I-Application
Turbo	I-Application
,	O
The	B-Application
King	I-Application
of	I-Application
Fighters	I-Application
2002	I-Application
,	O
and	O
Metal	B-Application
Slug	I-Application
X	I-Application
through	O
the	O
use	O
of	O
a	O
built-in	O
emulator	O
.	O
</s>
<s>
Video	O
game	O
companies	O
have	O
also	O
implemented	O
a	O
licensed	O
version	O
of	O
GGPO	B-Application
.	O
</s>
<s>
Games	O
using	O
it	O
include	O
Skullgirls	B-Application
and	O
Street	B-Application
Fighter	I-Application
III	I-Application
:	I-Application
3rd	I-Application
Strike	I-Application
Online	I-Application
Edition	I-Application
.	O
</s>
<s>
On	O
October	O
9	O
,	O
2019	O
Cannon	O
announced	O
on	O
his	O
Twitter	O
account	O
that	O
GGPO	B-Application
was	O
now	O
open	B-Application
source	I-Application
and	O
available	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
GGPO	B-Application
uses	O
a	O
netcode	B-Application
technique	O
called	O
"	O
rollback	O
"	O
.	O
</s>
<s>
Rather	O
than	O
waiting	O
for	O
input	O
to	O
be	O
received	O
from	O
other	O
players	O
before	O
simulating	O
the	O
next	O
frame	O
,	O
GGPO	B-Application
predicts	O
the	O
inputs	O
they	O
will	O
send	O
and	O
simulates	O
the	O
next	O
frame	O
without	O
delay	O
using	O
that	O
assumption	O
.	O
</s>
<s>
When	O
other	O
players’	O
inputs	O
arrive	O
,	O
if	O
any	O
input	O
did	O
n't	O
match	O
the	O
prediction	O
,	O
GGPO	B-Application
rolls	O
back	O
the	O
state	O
of	O
the	O
game	O
to	O
the	O
last	O
correct	O
state	O
,	O
then	O
replays	O
all	O
players’	O
revised	O
inputs	O
back	O
until	O
the	O
current	O
frame	O
.	O
</s>
<s>
The	O
client	O
program	O
can	O
allow	O
players	O
to	O
manually	O
adjust	O
native	O
input	O
delay	O
in	O
high-ping	O
situations	O
,	O
either	O
creating	O
a	O
possibly-jerky	O
yet	O
accurate	O
representation	O
or	O
a	O
smoother	O
game	O
with	O
input	O
delay	O
.	O
</s>
<s>
GGPO	B-Application
was	O
originally	O
bundled	O
with	O
a	O
client	O
which	O
enabled	O
users	O
to	O
play	O
supported	O
games	O
online	O
with	O
other	O
players	O
.	O
</s>
<s>
This	O
client	O
was	O
discontinued	O
,	O
and	O
superseded	O
by	O
other	O
clients	O
which	O
make	O
use	O
of	O
GGPO	B-Application
's	O
networking	O
middleware	B-General_Concept
,	O
such	O
as	O
Fightcade	B-Application
or	O
RedGGPO	O
.	O
</s>
