<s>
MS4	B-Application
Modeling	I-Application
Environment	I-Application
(	O
MS4	B-Application
Me	I-Application
)	O
is	O
a	O
discrete	B-Application
event	I-Application
simulation	I-Application
system	I-Application
(	O
DEVS	B-Application
)	O
software	O
developed	O
by	O
MS4	O
Systems	O
,	O
Inc	O
.	O
</s>
<s>
It	O
has	O
been	O
used	O
in	O
the	O
modeling	O
of	O
complex	O
systems	O
(	O
such	O
as	O
a	O
national	O
health	O
care	O
system	O
)	O
and	O
is	O
also	O
covered	O
in	O
a	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
and	O
systems	O
of	O
systems	O
modeling	O
text	O
.	O
</s>
<s>
MS4	B-Application
Me	I-Application
supports	O
the	O
development	O
and	O
simulation	O
of	O
DEVS	B-Application
models	O
via	O
a	O
natural	B-Language
language	I-Language
or	O
Java	B-Language
.	O
</s>
<s>
Finite	O
Deterministic	O
DEVS	B-Application
(	O
FDDEVS	O
)	O
models	O
can	O
also	O
be	O
quickly	O
developed	O
and	O
analyzed	O
.	O
</s>
<s>
DEVS	B-Application
models	O
can	O
be	O
composed	O
into	O
more	O
complex	O
systems	O
via	O
the	O
use	O
of	O
System	O
Entity	O
Structures	O
,	O
and	O
System	O
Entity	O
Structures	O
can	O
be	O
composed	O
into	O
complex	O
systems	O
of	O
systems	O
for	O
simulation	O
.	O
</s>
