<s>
Simple	B-Protocol
Symmetric	I-Protocol
Transport	I-Protocol
Protocol	I-Protocol
(	O
SSTP	O
)	O
is	O
a	O
protocol	O
for	O
delivering	O
messages	B-Architecture
between	O
clients	B-Operating_System
and	I-Operating_System
servers	I-Operating_System
.	O
</s>
<s>
It	O
is	O
used	O
by	O
Microsoft	B-Application
Groove	I-Application
.	O
</s>
