<s>
Vivaldi	O
Network	O
Coordinates	O
establish	O
a	O
virtual	O
positioning	O
system	O
that	O
has	O
a	O
prime	O
use	O
in	O
networking	B-Architecture
.	O
</s>
<s>
In	O
the	O
Azureus	B-Application
application	O
,	O
Vivaldi	O
is	O
used	O
to	O
improve	O
the	O
performance	O
of	O
the	O
distributed	B-Operating_System
hash	I-Operating_System
table	I-Operating_System
that	O
facilitates	O
query	O
matches	O
.	O
</s>
