<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
command	B-General_Concept
queue	I-General_Concept
is	O
a	O
queue	B-Application
for	O
enabling	O
the	O
delay	O
of	O
command	O
execution	O
,	O
either	O
in	O
order	O
of	O
priority	B-Application
,	O
on	O
a	O
first-in	B-Operating_System
first-out	I-Operating_System
basis	O
,	O
or	O
in	O
any	O
order	O
that	O
serves	O
the	O
current	O
purpose	O
.	O
</s>
<s>
Instead	O
of	O
waiting	O
for	O
each	O
command	O
to	O
be	O
executed	O
before	O
sending	O
the	O
next	O
one	O
,	O
the	O
program	O
just	O
puts	O
all	O
the	O
commands	O
in	O
the	O
queue	B-Application
and	O
goes	O
on	O
doing	O
other	O
things	O
while	O
the	O
queue	B-Application
is	O
processed	O
by	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
This	O
delegation	O
not	O
only	O
frees	O
the	O
program	O
from	O
handling	O
the	O
queue	B-Application
but	O
also	O
allows	O
a	O
more	O
optimized	O
execution	O
in	O
some	O
situations	O
.	O
</s>
<s>
For	O
instance	O
,	O
when	O
handling	O
multiple	O
requests	O
from	O
several	O
users	O
,	O
a	O
network	O
server	O
's	O
hard	O
drive	O
can	O
reorder	O
all	O
the	O
requests	O
in	O
its	O
queue	B-Application
using	O
,	O
for	O
instance	O
,	O
the	O
elevator	B-Algorithm
algorithm	I-Algorithm
to	O
minimize	O
the	O
mechanical	O
movement	O
.	O
</s>
