<s>
Multi-source	B-Protocol
,	O
as	O
it	O
applies	O
to	O
downloading	B-Application
data	I-Application
,	O
or	O
files	O
from	O
the	O
internet	O
,	O
is	O
a	O
method	O
of	O
decreasing	O
download	B-Application
time	O
for	O
large	O
files	O
by	O
getting	O
data	O
from	O
two	O
or	O
more	O
sources	O
.	O
</s>
<s>
A	O
program	O
that	O
can	O
handle	O
multi-source	B-Protocol
downloads	B-Application
will	O
connect	O
to	O
one	O
computer	O
and	O
begin	O
downloading	B-Application
the	O
desired	O
file	O
,	O
then	O
find	O
another	O
computer	O
hosting	O
the	O
same	O
file	O
and	O
begin	O
downloading	B-Application
that	O
file	O
as	O
well	O
.	O
</s>
<s>
The	O
program	O
controls	O
downloads	B-Application
so	O
that	O
each	O
source	O
file	O
provides	O
separate	O
data	O
and	O
the	O
user	O
does	O
not	O
download	B-Application
the	O
same	O
part	O
of	O
the	O
file	O
twice	O
.	O
</s>
<s>
The	O
program	O
then	O
builds	O
the	O
file	O
on	O
the	O
downloader	B-Application
's	O
computer	O
much	O
faster	O
than	O
it	O
would	O
if	O
it	O
had	O
to	O
wait	O
for	O
the	O
entire	O
file	O
to	O
be	O
downloaded	B-Application
from	O
a	O
single	O
source	O
.	O
</s>
<s>
This	O
works	O
faster	O
because	O
the	O
rate	O
at	O
which	O
the	O
file	O
servers	O
upload	O
is	O
finite	O
and	O
download	B-Application
rates	O
are	O
generally	O
faster	O
than	O
upload	O
rates	O
.	O
</s>
<s>
Therefore	O
,	O
downloading	B-Application
from	O
a	O
single	O
server	O
would	O
create	O
a	O
bottleneck	O
if	O
the	O
server	O
's	O
upload	O
rate	O
does	O
not	O
equal	O
your	O
maximum	O
download	B-Application
rate	O
.	O
</s>
<s>
So	O
distributing	O
the	O
download	B-Application
across	O
multiple	O
servers	O
allows	O
you	O
to	O
utilize	O
all	O
of	O
your	O
download	B-Application
rate	O
potential	O
.	O
</s>
<s>
Many	O
download	B-Protocol
managers	I-Protocol
use	O
the	O
principles	O
of	O
multi-source	B-Protocol
downloading	B-Application
.	O
</s>
<s>
ApexDC++	O
is	O
an	O
example	O
of	O
a	O
program	O
that	O
uses	O
multi-source	B-Protocol
downloading	B-Application
.	O
</s>
<s>
The	O
program	O
uses	O
a	O
DC	O
(	O
direct	O
connect	O
)	O
protocol	O
and	O
downloads	B-Application
a	O
large	O
file	O
by	O
dividing	O
it	O
into	O
smaller	O
parts	O
and	O
downloading	B-Application
the	O
smaller	O
parts	O
from	O
different	O
hosts	O
.	O
</s>
