<s>
ExtendSim	B-Application
(	O
formerly	O
known	O
as	O
Extend	O
)	O
is	O
a	O
simulation	B-Application
program	I-Application
for	O
modeling	O
discrete	B-General_Concept
event	I-General_Concept
,	O
continuous	B-General_Concept
,	O
agent-based	O
,	O
discrete	B-Application
rate	I-Application
,	O
and	O
mixed-mode	O
processes	O
.	O
</s>
<s>
There	O
are	O
three	O
ExtendSim	B-Application
packages	O
:	O
CP	O
for	O
continuous	B-General_Concept
processes	O
;	O
DE	O
which	O
adds	O
discrete	B-General_Concept
event	I-General_Concept
technology	O
;	O
and	O
Pro	O
which	O
adds	O
discrete	B-Application
rate	I-Application
and	O
reliability	O
block	O
diagramming	O
modules	O
.	O
</s>
<s>
Data	O
for	O
the	O
model	O
resides	O
in	O
the	O
parameters	O
of	O
the	O
blocks	O
and	O
in	O
a	O
proprietary	B-Application
database	O
.	O
</s>
<s>
New	O
blocks	O
can	O
be	O
created	O
by	O
combining	O
existing	O
blocks	O
into	O
a	O
single	O
hierarchical	O
block	O
or	O
by	O
programming	O
a	O
block	O
in	O
ExtendSim	B-Application
's	O
c-based	B-Language
language	O
,	O
ModL	O
.	O
</s>
<s>
The	O
major	O
libraries	O
in	O
ExtendSim	B-Application
are	O
:	O
</s>
