<s>
In	O
computing	O
,	O
open	B-General_Concept
implementation	I-General_Concept
platforms	B-Device
are	O
systems	O
where	O
the	O
implementation	O
is	O
accessible	O
.	O
</s>
<s>
Open	B-General_Concept
implementation	I-General_Concept
allows	O
developers	O
of	O
a	O
program	O
to	O
alter	O
pieces	O
of	O
the	O
underlying	O
software	O
to	O
fit	O
their	O
specific	O
needs	O
.	O
</s>
<s>
Open	B-General_Concept
implementation	I-General_Concept
is	O
not	O
to	O
be	O
confused	O
with	O
open	B-License
source	I-License
,	O
which	O
allows	O
users	O
to	O
change	O
implementation	O
source	O
code	O
,	O
rather	O
than	O
using	O
existing	O
application	B-Application
programming	I-Application
interfaces	I-Application
.	O
</s>
