<s>
A	O
Runtime	B-Application
Callable	I-Application
Wrapper	I-Application
(	O
RCW	O
)	O
is	O
a	O
proxy	O
object	O
generated	O
by	O
the	O
.NET	B-Application
Common	O
Language	O
Runtime	O
(	O
CLR	O
)	O
in	O
order	O
to	O
allow	O
a	O
Component	B-Application
Object	I-Application
Model	I-Application
(	O
COM	O
)	O
object	O
to	O
be	O
accessed	O
from	O
managed	O
code	O
.	O
</s>
<s>
Although	O
the	O
RCW	O
appears	O
to	O
be	O
an	O
ordinary	O
object	O
to	O
.NET	B-Application
clients	O
,	O
its	O
primary	O
function	O
is	O
to	O
marshal	B-Application
calls	O
and	O
data	O
between	O
a	O
.NET	B-Application
client	O
and	O
a	O
COM	B-Application
object	I-Application
.	O
</s>
<s>
The	O
runtime	O
creates	O
exactly	O
one	O
RCW	O
for	O
each	O
COM	B-Application
object	I-Application
,	O
regardless	O
of	O
the	O
number	O
of	O
references	O
that	O
exist	O
on	O
that	O
object	O
.	O
</s>
