<s>
A	O
Pool	B-Protocol
User	I-Protocol
(	O
PU	O
)	O
is	O
a	O
client	B-Protocol
in	O
the	O
Reliable	B-Protocol
Server	I-Protocol
Pooling	I-Protocol
(	O
RSerPool	B-Protocol
)	O
framework	O
.	O
</s>
<s>
Ask	O
a	O
Pool	B-Protocol
Registrar	I-Protocol
for	O
server	O
selection	O
(	O
the	O
Pool	B-Protocol
Registrar	I-Protocol
will	O
return	O
a	O
list	O
of	O
servers	O
,	O
called	O
Pool	B-Protocol
Elements	I-Protocol
)	O
,	O
</s>
<s>
Select	O
one	O
Pool	B-Protocol
Element	I-Protocol
,	O
establish	O
a	O
connection	O
and	O
use	O
the	O
actual	O
service	O
,	O
</s>
<s>
Report	O
failed	O
servers	O
to	O
the	O
Pool	B-Protocol
Registrar	I-Protocol
.	O
</s>
