<s>
Neubot	B-Language
(	O
the	O
network	O
neutrality	O
bot	B-Protocol
)	O
is	O
a	O
free	B-Application
software	I-Application
Internet	B-Protocol
bot	I-Protocol
,	O
developed	O
and	O
maintained	O
by	O
the	O
Nexa	O
Center	O
for	O
Internet	O
and	O
Society	O
,	O
that	O
gathers	O
network	O
performance	O
data	O
useful	O
to	O
investigate	O
network	O
neutrality	O
.	O
</s>
<s>
Once	O
installed	O
on	O
the	O
user	O
's	O
computer	O
,	O
it	O
runs	B-Operating_System
in	I-Operating_System
the	I-Operating_System
background	I-Operating_System
and	O
periodically	O
performs	O
active	O
transmission	B-Protocol
tests	I-Protocol
with	O
servers	O
hosted	O
by	O
the	O
distributed	O
Measurement	O
Lab	O
server	O
platform	O
(	O
and	O
,	O
in	O
future	O
,	O
with	O
other	O
instances	O
of	O
the	O
software	O
itself	O
)	O
.	O
</s>
<s>
These	O
transmission	B-Protocol
tests	I-Protocol
measure	O
end-to-end	O
network	O
performance	O
emulating	O
different	O
protocols	O
(	O
currently	O
HTTP	B-Protocol
and	O
BitTorrent	B-Protocol
)	O
as	O
well	O
as	O
transmitting	O
and	O
receiving	O
"	O
raw	O
"	O
data	O
over	O
TCP	B-Protocol
.	O
</s>
<s>
Performance	O
are	O
measured	O
at	O
application	B-Application
level	I-Application
as	O
well	O
as	O
at	O
TCP	B-Architecture
level	I-Architecture
(	O
using	O
Web100	O
)	O
.	O
</s>
