<s>
Windows	O
Process	O
Activation	O
Service	O
(	O
also	O
known	O
as	O
WAS	O
)	O
is	O
the	O
process	O
activation	O
mechanism	O
introduced	O
within	O
Internet	B-Application
Information	I-Application
Services	I-Application
v7.0	O
.	O
</s>
<s>
Windows	O
Activation	O
Service	O
builds	O
on	O
the	O
existing	O
Internet	B-Application
Information	I-Application
Services	I-Application
v6.0	O
but	O
is	O
more	O
powerful	O
because	O
it	O
provides	O
support	O
for	O
other	O
protocols	O
besides	O
HTTP	B-Protocol
,	O
such	O
as	O
TCP	B-Protocol
and	O
Named	B-Operating_System
Pipes	I-Operating_System
.	O
</s>
<s>
Windows	O
Activation	O
Service	O
extends	O
the	O
ASP.NET	B-Application
HTTP	B-Protocol
hosting	O
concept	O
(	O
ASMX	O
Web	O
Services	O
)	O
.	O
</s>
<s>
As	O
a	O
standalone	O
Windows	O
component	O
,	O
Windows	O
Activation	O
Service	O
is	O
completely	O
separated	O
from	O
the	O
IIS	O
hosting	O
environment	O
and	O
provides	O
a	O
protocol-agnostic	O
activation	O
mechanism	O
not	O
limited	O
to	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
For	O
HTTP	B-Protocol
,	O
data	O
transfer	O
relies	O
on	O
the	O
ASP.NET	B-Application
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
For	O
protocols	O
such	O
as	O
TCP	B-Protocol
and	O
Named	B-Operating_System
Pipes	I-Operating_System
,	O
Windows	O
Activation	O
Service	O
leverages	O
the	O
extensibility	O
points	O
of	O
ASP.NET	B-Application
for	O
transferring	O
data	O
.	O
</s>
