<s>
Creeper	B-Application
was	O
the	O
first	O
computer	O
worm	O
,	O
while	O
Reaper	B-Application
was	O
the	O
first	O
antivirus	B-Application
software	I-Application
,	O
designed	O
to	O
eliminate	O
Creeper	B-Application
.	O
</s>
<s>
Creeper	B-Application
was	O
an	O
experimental	O
computer	O
program	O
written	O
by	O
Bob	B-Application
Thomas	I-Application
at	O
BBN	O
in	O
1971	O
.	O
</s>
<s>
Its	O
original	O
iteration	O
was	O
designed	O
to	O
move	O
between	O
DEC	B-Device
PDP-10	I-Device
mainframe	B-Architecture
computers	I-Architecture
running	O
the	O
TENEX	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
using	O
the	O
ARPANET	O
,	O
with	O
a	O
later	O
version	O
by	O
Ray	O
Tomlinson	O
designed	O
to	O
copy	O
itself	O
between	O
computers	O
rather	O
than	O
simply	O
move	O
.	O
</s>
<s>
This	O
self-replicating	O
version	O
of	O
Creeper	B-Application
is	O
generally	O
accepted	O
to	O
be	O
the	O
first	O
computer	O
worm	O
.	O
</s>
<s>
Creeper	B-Application
was	O
a	O
test	O
created	O
to	O
demonstrate	O
the	O
possibility	O
of	O
a	O
self-replicating	O
computer	O
program	O
that	O
could	O
spread	O
to	O
other	O
computers	O
.	O
</s>
<s>
Reaper	B-Application
was	O
the	O
first	O
anti-virus	B-Application
software	I-Application
,	O
designed	O
to	O
delete	O
Creeper	B-Application
by	O
moving	O
across	O
the	O
ARPANET	O
.	O
</s>
<s>
The	O
conflict	O
between	O
Creeper	B-Application
and	I-Application
Reaper	I-Application
served	O
as	O
inspiration	O
for	O
the	O
programming	B-Language
game	I-Language
Core	B-Application
War	I-Application
,	O
while	O
fictionalized	O
versions	O
of	O
Reaper	B-Application
have	O
been	O
used	O
as	O
antagonists	O
in	O
the	O
anime	O
Digimon	O
Tamers	O
and	O
the	O
visual	O
novel	O
Digital	B-Application
:	I-Application
A	I-Application
Love	I-Application
Story	I-Application
.	O
</s>
<s>
A	O
humanized	O
Creeper	B-Application
has	O
also	O
appeared	O
in	O
the	O
webcomic	O
Internet	O
Explorer	O
,	O
alongside	O
the	O
likewise	O
personified	O
Morris	O
Worm	O
.	O
</s>
