<s>
DCE/RPC	B-General_Concept
,	O
short	O
for	O
"	O
Distributed	B-Operating_System
Computing	I-Operating_System
Environment	I-Operating_System
/	O
Remote	B-Operating_System
Procedure	I-Operating_System
Calls	I-Operating_System
"	O
,	O
is	O
the	O
remote	B-Operating_System
procedure	I-Operating_System
call	I-Operating_System
system	O
developed	O
for	O
the	O
Distributed	B-Operating_System
Computing	I-Operating_System
Environment	I-Operating_System
(	O
DCE	O
)	O
.	O
</s>
<s>
This	O
system	O
allows	O
programmers	O
to	O
write	O
distributed	B-Architecture
software	I-Architecture
as	O
if	O
it	O
were	O
all	O
working	O
on	O
the	O
same	O
computer	O
,	O
without	O
having	O
to	O
worry	O
about	O
the	O
underlying	O
network	O
code	O
.	O
</s>
<s>
DCE/RPC	B-General_Concept
was	O
commissioned	O
by	O
the	O
Open	B-Application
Software	I-Application
Foundation	I-Application
in	O
a	O
"	O
Request	O
for	O
Technology	O
"	O
(	O
1993	O
David	O
Chappell	O
)	O
.	O
</s>
<s>
One	O
of	O
the	O
key	O
companies	O
that	O
contributed	O
was	O
Apollo	O
Computer	O
,	O
who	O
brought	O
in	O
NCA	O
-	O
"	O
Network	O
Computing	O
Architecture	O
"	O
which	O
became	O
Network	B-Protocol
Computing	I-Protocol
System	I-Protocol
(	O
NCS	O
)	O
and	O
then	O
a	O
major	O
part	O
of	O
DCE/RPC	B-General_Concept
itself	O
.	O
</s>
<s>
The	O
naming	O
convention	O
for	O
transports	O
that	O
can	O
be	O
designed	O
(	O
as	O
architectural	O
plugins	O
)	O
and	O
then	O
made	O
available	O
to	O
DCE/RPC	B-General_Concept
echoes	O
these	O
origins	O
,	O
e.g.	O
</s>
<s>
ncacn_np	O
(	O
SMB	B-Operating_System
Named	B-Operating_System
Pipes	I-Operating_System
transport	O
)	O
;	O
ncacn_tcp	O
(	O
DCE/RPC	B-General_Concept
over	O
TCP/IP	O
)	O
and	O
ncacn_http	O
to	O
name	O
a	O
small	O
number	O
.	O
</s>
<s>
DCE/RPC	B-General_Concept
'	O
s	O
history	O
is	O
such	O
that	O
it	O
's	O
sometimes	O
cited	O
as	O
an	O
example	O
of	O
design	O
by	O
committee	O
.	O
</s>
<s>
It	O
is	O
also	O
frequently	O
noted	O
for	O
its	O
complexity	O
,	O
however	O
this	O
complexity	O
is	O
often	O
a	O
result	O
of	O
features	O
that	O
target	O
large	O
distributed	B-Architecture
systems	I-Architecture
and	O
which	O
are	O
often	O
unmatched	O
by	O
more	O
recent	O
RPC	O
implementations	O
such	O
as	O
SOAP	B-Application
.	O
</s>
<s>
As	O
of	O
January	O
12	O
,	O
2005	O
,	O
it	O
is	O
available	O
under	O
a	O
recognized	O
open	O
source	O
license	O
(	O
LGPL	B-Application
)	O
,	O
which	O
permits	O
a	O
broader	O
community	O
to	O
work	O
on	O
the	O
source	O
to	O
expand	O
its	O
features	O
and	O
keep	O
it	O
current	O
.	O
</s>
<s>
The	B-Application
Open	I-Application
Group	I-Application
has	O
stated	O
it	O
will	O
work	O
with	O
the	O
DCE	O
community	O
to	O
make	O
DCE	O
available	O
to	O
the	O
open	O
source	O
development	O
community	O
,	O
as	O
well	O
as	O
continuing	O
to	O
offer	O
the	O
source	O
through	O
The	B-Application
Open	I-Application
Group	I-Application
’s	O
web	O
site	O
.	O
</s>
<s>
DCE/RPC	B-General_Concept
'	O
s	O
reference	O
implementation	O
(	O
version	O
1.1	O
)	O
was	O
previously	O
available	O
under	O
the	O
BSD-compatible	O
(	O
Free	O
Software	O
)	O
OSF/1.0	O
license	O
,	O
and	O
is	O
still	O
available	O
for	O
at	O
least	O
Solaris	O
,	O
AIX	O
and	O
VMS	O
.	O
</s>
<s>
DCE	O
is	O
also	O
still	O
available	O
under	O
the	O
previous	O
non	O
open-source	O
license	O
terms	O
from	O
the	B-Application
Open	I-Application
Group	I-Application
website	O
.	O
</s>
<s>
FreeDCE	B-Operating_System
is	O
the	O
DCE	O
1.1	O
reference	O
implementation	O
ported	O
to	O
Linux	O
,	O
supports	O
64-bit	B-Device
platforms	O
,	O
and	O
is	O
autoconf	B-Application
'd	O
to	O
make	O
porting	O
to	O
further	O
platforms	O
much	O
easier	O
:	O
a	O
Win32	O
port	O
is	O
underway	O
.	O
</s>
<s>
Microsoft	O
's	O
version	O
of	O
DCE/RPC	B-General_Concept
,	O
called	O
"	O
MSRPC	B-General_Concept
"	O
,	O
is	O
integrated	O
into	O
Windows	B-Device
NT	I-Device
.	O
</s>
<s>
MSRPC	B-General_Concept
is	O
derived	O
from	O
the	O
DCE	O
1.1	O
reference	O
implementation	O
.	O
</s>
<s>
Samba	B-Language
contains	O
an	O
implementation	O
of	O
MSRPC	B-General_Concept
that	O
is	O
intended	O
to	O
be	O
network-interoperable	O
and	O
IDL-interoperable	O
with	O
MSRPC	B-General_Concept
.	O
</s>
<s>
It	O
is	O
not	O
binary-interoperable	O
with	O
MSRPC	B-General_Concept
.	O
</s>
<s>
The	O
Wine	B-Application
Project	I-Application
contains	O
an	O
implementation	O
of	O
MSRPC	B-General_Concept
that	O
is	O
intended	O
to	O
be	O
binary-interoperable	O
and	O
IDL-interoperable	O
with	O
MSRPC	B-General_Concept
.	O
</s>
<s>
It	O
is	O
not	O
network-interoperable	O
with	O
MSRPC	B-General_Concept
.	O
</s>
<s>
J-Interop	O
is	O
a	O
working	O
MSRPC	B-General_Concept
implementation	O
in	O
Java	O
.	O
</s>
<s>
It	O
is	O
currently	O
used	O
by	O
OpenNMS	B-Language
for	O
retrieving	O
WMI	O
data	O
for	O
system	O
monitoring	O
.	O
</s>
