<s>
A	O
contact	B-Protocol
list	I-Protocol
is	O
a	O
collection	O
of	O
screen	O
names	O
.	O
</s>
<s>
It	O
is	O
a	O
commonplace	O
feature	O
of	O
instant	O
messaging	O
,	O
Email	B-Protocol
clients	I-Protocol
,	O
online	O
games	O
and	O
mobile	O
phones	O
.	O
</s>
<s>
Contacts	B-Protocol
lists	I-Protocol
 '	O
windows	O
show	O
screen	O
names	O
that	O
represent	O
actual	O
other	O
people	O
.	O
</s>
<s>
In	O
some	O
programs	O
,	O
if	O
your	O
contact	B-Protocol
list	I-Protocol
shows	O
someone	O
,	O
their	O
list	O
will	O
show	O
yours	O
.	O
</s>
<s>
Contact	B-Protocol
lists	I-Protocol
for	O
mobile	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
are	O
often	O
shared	O
among	O
several	O
mobile	B-Application
apps	I-Application
.	O
</s>
<s>
With	O
most	O
programs	O
,	O
the	O
contact	B-Protocol
list	I-Protocol
can	O
be	O
minimized	O
to	O
keep	O
it	O
from	O
getting	O
in	O
the	O
way	O
,	O
and	O
is	O
accessed	O
again	O
by	O
selecting	O
its	O
icon	O
.	O
</s>
<s>
The	O
style	O
of	O
the	O
contact	B-Protocol
list	I-Protocol
is	O
different	O
with	O
the	O
different	O
programs	O
,	O
but	O
all	O
contact	B-Protocol
lists	I-Protocol
have	O
similar	O
capabilities	O
.	O
</s>
