<s>
DGD	O
,	O
Dworkin	B-Application
's	I-Application
Game	I-Application
Driver	I-Application
(	O
at	O
one	O
time	O
called	O
Dworkin	B-Application
's	I-Application
Generic	I-Application
Driver	I-Application
)	O
,	O
is	O
an	O
LPMud	B-Application
server	O
written	O
by	O
Felix	O
A	O
.	O
</s>
<s>
DGD	O
pioneered	O
important	O
technical	O
innovations	O
in	O
MUDs	B-Application
,	O
particularly	O
disk-based	O
object	O
storage	O
,	O
full	O
world	B-Protocol
persistence	I-Protocol
,	O
separation	O
of	O
concerns	O
between	O
driver	O
and	O
mudlib	O
,	O
runtime	O
morphism	O
,	O
automatic	O
garbage	O
collection	O
,	O
lightweight	O
objects	O
and	O
LPC-to-C	O
compilation	O
.	O
</s>
<s>
The	O
first	O
publicly	O
available	O
MUD	B-Application
to	O
use	O
DGD	O
was	O
PaderMUD	B-Protocol
(	O
later	O
Xyllomer	B-Protocol
)	O
,	O
in	O
December	O
1993	O
.	O
</s>
<s>
The	O
original	O
primary	O
development	O
MUD	B-Application
for	O
DGD	O
was	O
The	O
Pattern	O
,	O
referencing	O
The	O
Chronicles	O
of	O
Amber	O
(	O
like	O
Croes	O
's	O
pseudonym	O
Dworkin	O
,	O
which	O
refers	O
to	O
Dworkin	O
Barimen	O
)	O
.	O
</s>
<s>
On	O
February	O
3	O
,	O
2010	O
,	O
DGD	O
1.4	O
was	O
released	O
as	O
open-source	B-Application
software	I-Application
.	O
</s>
