<s>
In	O
computing	O
,	O
share	O
is	O
a	O
command	B-Application
for	O
DOS	B-Device
that	O
allows	O
software	O
to	O
perform	O
file	B-Application
locks	I-Application
.	O
</s>
<s>
Locking	O
files	O
became	O
necessary	O
when	O
MS-DOS	B-Application
began	O
allowing	O
files	O
to	O
be	O
accessed	O
simultaneously	O
by	O
multiple	O
programs	O
,	O
either	O
through	O
multitasking	B-Operating_System
or	O
networking	B-Architecture
.	O
</s>
<s>
On	O
MS-DOS	B-Application
,	O
the	O
command	B-Application
is	O
available	O
in	O
versions	O
3	O
and	O
later	O
.	O
</s>
<s>
The	O
command	B-Application
is	O
also	O
available	O
in	O
FreeDOS	B-Application
,	O
PTS-DOS	B-Operating_System
,	O
and	O
SISNE	B-Operating_System
plus	I-Operating_System
.	O
</s>
<s>
The	O
FreeDOS	B-Application
version	O
was	O
developed	O
by	O
Ron	O
Cemer	O
and	O
is	O
licensed	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
DR	B-Application
DOS	I-Application
6.0	O
and	O
Datalight	O
ROM-DOS	B-Operating_System
include	O
an	O
implementation	O
of	O
the	O
command	B-Application
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
and	O
later	O
versions	O
include	O
16-bit	B-Device
commands	O
(	O
nonnative	O
)	O
for	O
the	O
MS-DOS	B-Application
subsystem	O
that	O
are	O
included	O
to	O
maintain	O
MS-DOS	B-Application
compatibility	O
.	O
</s>
<s>
The	O
share	O
MS-DOS	B-Application
subsystem	O
command	B-Application
performs	O
functions	O
that	O
are	O
now	O
inherent	O
to	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
It	O
is	O
available	O
to	O
preserve	O
compatibility	O
with	O
existing	O
files	O
,	O
but	O
has	O
no	O
effect	O
at	O
the	O
command	B-Application
line	I-Application
because	O
the	O
functionality	O
is	O
automatic	O
.	O
</s>
<s>
The	O
16-bit	B-Device
MS-DOS	B-Application
subsystem	O
commands	O
are	O
not	O
available	O
on	O
64-bit	B-Device
editions	O
of	O
Windows	B-Application
.	O
</s>
