<s>
Code	B-Protocol
Co-op	I-Protocol
is	O
the	O
peer-to-peer	O
revision	B-Architecture
control	I-Architecture
system	I-Architecture
made	O
by	O
Reliable	O
Software	O
.	O
</s>
<s>
Code	B-Protocol
Co-op	I-Protocol
is	O
a	O
distributed	O
revision	B-Architecture
control	I-Architecture
system	I-Architecture
of	O
the	O
replicated	O
type	O
.	O
</s>
<s>
The	O
replicas	B-Architecture
are	O
synchronized	O
by	O
the	O
exchange	O
of	O
(	O
differential	O
)	O
scripts	O
.	O
</s>
<s>
The	O
exchange	O
of	O
scripts	O
may	O
proceed	O
using	O
different	O
transports	O
,	O
including	O
e-mail	O
(	O
support	O
for	O
SMTP	B-Protocol
and	O
POP3	B-Protocol
,	O
integration	O
with	O
MAPI	B-Protocol
clients	O
,	O
Gmail	B-Application
)	O
and	O
LAN	B-General_Concept
.	O
</s>
<s>
Code	B-Protocol
Co-op	I-Protocol
has	O
a	O
built-in	O
peer-to-peer	O
wiki	O
system	O
,	O
which	O
can	O
be	O
used	O
to	O
integrate	O
documentation	O
with	O
a	O
software	O
project	O
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
to	O
create	O
text-based	O
Wiki	O
databases	O
,	O
which	O
can	O
be	O
queried	O
using	O
simplified	O
SQL	B-Language
directly	O
from	O
wiki	O
pages	O
.	O
</s>
<s>
Code	B-Protocol
Co-op	I-Protocol
was	O
one	O
of	O
the	O
first	O
distributed	O
version	B-Architecture
control	I-Architecture
systems	I-Architecture
.	O
</s>
<s>
The	O
development	O
of	O
Code	B-Protocol
Co-op	I-Protocol
started	O
in	O
1996	O
,	O
when	O
Reliable	O
Software	O
,	O
the	O
distributed	O
software	O
company	O
that	O
makes	O
it	O
,	O
was	O
established	O
.	O
</s>
<s>
Each	O
user	O
of	O
Code	B-Protocol
Co-op	I-Protocol
had	O
to	O
have	O
a	O
full	O
replica	B-Architecture
of	O
the	O
repository	O
,	O
including	O
the	O
history	O
of	O
changes	O
.	O
</s>
<s>
The	O
problem	O
was	O
reduced	O
to	O
that	O
of	O
designing	O
a	O
distributed	B-Operating_System
database	I-Operating_System
that	O
uses	O
slow	O
and	O
unreliable	O
transport	O
for	O
synchronization	O
(	O
later	O
,	O
faster	O
LAN	B-General_Concept
transport	O
was	O
also	O
added	O
)	O
.	O
</s>
<s>
In	O
2018	O
,	O
the	O
C++	O
source	O
code	O
for	O
Code	B-Protocol
Co-op	I-Protocol
was	O
released	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
Code	B-Protocol
Co-op	I-Protocol
is	O
an	O
example	O
of	O
a	O
distributed	B-Operating_System
database	I-Operating_System
.	O
</s>
<s>
Local	O
repositories	O
are	O
considered	O
the	O
replicas	B-Architecture
of	O
this	O
virtual	O
database	O
.	O
</s>
<s>
Each	O
check-in	O
corresponds	O
to	O
a	O
distributed	O
commit	O
—	O
a	O
non-blocking	O
version	O
of	O
a	O
two-phase	B-General_Concept
commit	I-General_Concept
.	O
</s>
