<s>
The	O
QSDK	B-General_Concept
is	O
a	O
streaming	O
scene	B-Data_Structure
graph	I-Data_Structure
retained-mode	O
Application	B-Application
Programming	I-Application
Interface	I-Application
(	O
API	B-Application
)	O
combined	O
with	O
a	O
cell-portal	O
system	O
to	O
connect	O
scene	B-Data_Structure
graphs	I-Data_Structure
.	O
</s>
<s>
It	O
is	O
available	O
on	O
Macintosh	O
,	O
PlayStation	O
2	O
and	O
Xbox	O
platforms	O
,	O
and	O
for	O
free	O
on	O
PC	B-Device
platforms	O
.	O
</s>
