<s>
In	O
computer	B-General_Concept
science	I-General_Concept
nano-threads	B-Operating_System
are	O
highly	O
optimized	O
lightweight	O
threads	B-Operating_System
designed	O
for	O
use	O
on	O
shared	B-Operating_System
memory	I-Operating_System
multiprocessors	B-Operating_System
(	O
such	O
as	O
SMPs	O
)	O
.	O
</s>
<s>
The	O
Nano-threads	B-Operating_System
specification	O
was	O
written	O
in	O
1997	O
.	O
</s>
