<s>
n2n	B-Application
is	O
an	O
open	O
source	O
Layer	B-Protocol
2	I-Protocol
over	O
Layer	B-Application
3	I-Application
VPN	B-Application
app	O
utilising	O
peer-to-peer	O
architecture	O
for	O
network	O
membership	O
and	O
routing	O
.	O
</s>
<s>
Unlike	O
many	O
other	O
VPN	B-Application
programs	O
,	O
n2n	B-Application
can	O
also	O
connect	O
computers	O
which	O
reside	O
behind	O
NAT	B-Protocol
routers	O
.	O
</s>
<s>
It	O
is	O
free	B-Application
software	I-Application
licensed	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
v3	O
.	O
</s>
<s>
Turbo	O
VPN	B-Application
is	O
a	O
custom	O
Windows	O
server/client	O
implementation	O
of	O
n2n	B-Application
.	O
</s>
