<s>
Configuration	B-Protocol
Management	I-Protocol
Version	I-Protocol
Control	I-Protocol
(	O
CMVC	B-Protocol
)	O
is	O
a	O
software	O
package	O
that	O
serves	O
as	O
an	O
object	O
repository	O
,	O
and	O
performs	O
software	O
version	B-Architecture
control	I-Architecture
,	O
configuration	O
management	O
,	O
and	O
change	O
management	O
functions	O
.	O
</s>
<s>
A	O
relational	O
database	O
was	O
used	O
to	O
keep	O
tracking	O
information	O
but	O
a	O
separate	O
Source	B-Architecture
Control	I-Architecture
Manager	O
such	O
as	O
Source	B-Device
Code	I-Device
Control	I-Device
System	I-Device
(	O
SCCS	O
)	O
or	O
PVCS	O
was	O
used	O
to	O
maintain	O
version	O
history	O
for	O
each	O
file	O
.	O
</s>
<s>
Similar	O
to	O
a	O
"	O
tag	O
"	O
in	O
other	O
source	B-Architecture
control	I-Architecture
systems	O
-	O
but	O
with	O
a	O
twist	O
.	O
</s>
<s>
Defect	O
tracking	O
was	O
integrated	O
into	O
the	O
source	B-Architecture
control	I-Architecture
system	O
.	O
</s>
<s>
This	O
was	O
typical	O
for	O
source	B-Architecture
control	I-Architecture
systems	O
of	O
that	O
time	O
period	O
but	O
would	O
be	O
considered	O
a	O
major	O
weakness	O
today	O
.	O
</s>
<s>
Although	O
,	O
this	O
is	O
a	O
failing	O
of	O
nearly	O
all	O
remote	O
source	B-Architecture
control	I-Architecture
systems	O
unless	O
a	O
local	O
repository	O
is	O
created	O
,	O
giving	O
the	O
illusion	O
of	O
redundancy	O
and	O
source	B-Architecture
control	I-Architecture
,	O
which	O
will	O
ultimately	O
require	O
a	O
sync	O
with	O
the	O
remote	O
source	B-Architecture
control	I-Architecture
server	O
at	O
some	O
point	O
to	O
submit	O
any	O
deltas	O
.	O
</s>
<s>
In	O
the	O
1990s	O
,	O
this	O
system	O
was	O
used	O
to	O
manage	O
the	O
IBM	B-Application
OS/2	I-Application
and	O
IBM	B-Application
AIX	I-Application
source	O
code	O
repositories	O
.	O
</s>
<s>
CMVC	B-Protocol
sales	O
and	O
support	O
terminated	O
some	O
time	O
after	O
IBM	O
acquired	O
Rational	O
Software	O
,	O
its	O
functions	O
being	O
superseded	O
by	O
products	O
in	O
the	O
Rational	O
product	O
line	O
(	O
Rational	B-Protocol
ClearCase	I-Protocol
and	O
Rational	O
ClearQuest	O
)	O
.	O
</s>
<s>
However	O
,	O
some	O
customer	O
installations	O
of	O
CMVC	B-Protocol
remain	O
in	O
use	O
.	O
</s>
