<s>
4DOS	B-Application
is	O
a	O
command-line	O
interpreter	O
by	O
JP	B-Application
Software	I-Application
,	O
designed	O
to	O
replace	O
the	O
default	O
command	O
interpreter	O
COMMAND.COM	B-Operating_System
in	O
Microsoft	B-Application
DOS	I-Application
and	O
Windows	B-Application
.	O
</s>
<s>
It	O
was	O
written	O
by	O
Rex	B-Application
C	I-Application
.	I-Application
Conn	I-Application
and	O
Tom	B-Application
Rawson	I-Application
and	O
first	O
released	O
in	O
1989	O
.	O
</s>
<s>
4OS2	B-Application
and	O
4NT	B-Application
are	O
similar	O
products	O
that	O
replace	O
cmd.exe	B-Device
in	O
OS/2	B-Application
and	O
Windows	B-Device
NT	I-Device
respectively	O
.	O
</s>
<s>
4DOS	B-Application
is	O
most	O
often	O
used	O
as	O
a	O
command-line	O
replacement	O
for	O
the	O
following	O
operating	O
systems	O
:	O
</s>
<s>
command-line	O
:	O
MS-DOS	B-Application
,	O
IBM	B-Operating_System
PC	I-Operating_System
DOS	I-Operating_System
,	O
DR-DOS	B-Application
.	O
</s>
<s>
graphical	O
:	O
Windows	B-Application
95	I-Application
to	O
Windows	B-Device
98	I-Device
,	O
Windows	B-Application
98SE	O
.	O
</s>
<s>
Since	O
Windows	B-Device
NT	I-Device
and	O
Windows	B-Application
2000	O
includes	O
both	O
COMMAND.COM	B-Operating_System
and	O
cmd.exe	B-Device
,	O
4DOS	B-Application
and	O
4NT	B-Application
and	O
derivatives	O
can	O
both	O
be	O
installed	O
.	O
</s>
<s>
Earlier	O
versions	O
of	O
4OS2	B-Application
can	O
be	O
run	O
under	O
Windows	B-Device
NT	I-Device
,	O
and	O
OS/2	B-Application
can	O
run	O
the	O
two	O
DOS	B-Device
and	O
Windows	B-Device
NT	I-Device
shells	O
,	O
all	O
three	O
can	O
be	O
used	O
on	O
Windows	O
NT-type	O
machines	O
and	O
OS/2	B-Application
multiple	O
boot	O
machines	O
.	O
</s>
<s>
Among	O
the	O
many	O
commands	O
,	O
statements	O
and	O
functions	O
in	O
4DOS	B-Application
and	O
lacking	O
in	O
MS-DOS/Windows	O
95-98	O
COMMAND.COM	B-Operating_System
are	O
reading	O
keyboard	O
input	O
and	O
a	O
simpler	O
method	O
of	O
working	O
with	O
colors	O
of	O
screen	O
and	O
text	O
.	O
</s>
<s>
The	O
default	O
file	O
extension	O
for	O
4DOS	B-Application
scripts	O
is	O
.btm	O
.	O
</s>
<s>
A	O
graphical	O
version	O
of	O
4DOS	B-Application
,	O
4OS2	B-Application
,	O
and	O
4NT	B-Application
,	O
called	O
Take	B-Application
Command	I-Application
,	O
was	O
released	O
with	O
a	O
feature	O
set	O
corresponding	O
to	O
version	O
4DOS	B-Application
5.5	O
,	O
4OS2	B-Application
,	O
and	O
4NT	B-Application
2.5	O
and	O
updated	O
after	O
this	O
.	O
</s>
<s>
Development	O
on	O
this	O
line	O
stopped	O
with	O
the	O
corresponding	O
text	B-Application
mode	I-Application
versions	O
.	O
</s>
<s>
There	O
was	O
a	O
graphical	O
program	O
Take	B-Application
Command/16	I-Application
,	O
for	O
Windows	B-Application
3.1	O
.	O
</s>
<s>
4OS2	B-Application
is	O
a	O
similar	O
replacement	O
for	O
IBM	O
's	O
OS/2	B-Application
command	O
interpreter	O
.	O
</s>
<s>
This	O
was	O
first	O
released	O
at	O
the	O
same	O
time	O
as	O
4DOS	B-Application
version	O
4	O
,	O
and	O
has	O
a	O
similar	O
feature	O
set	O
.	O
</s>
<s>
Like	O
4DOS	B-Application
,	O
this	O
is	O
released	O
as	O
open	O
source	O
.	O
</s>
<s>
It	O
appeared	O
in	O
the	O
feature	O
set	O
of	O
2011	O
's	O
eComStation	B-Device
2.10	O
,	O
in	O
the	O
freeware	B-License
os2free	O
project	O
,	O
and	O
is	O
included	O
with	O
ArcaOS	B-Device
.	O
</s>
<s>
4NT	B-Application
was	O
first	O
released	O
as	O
4DOS	B-Application
for	I-Application
Windows	I-Application
NT	I-Application
(	O
versions	O
1.x	O
,	O
2.x	O
)	O
,	O
but	O
became	O
4NT	B-Application
until	O
the	O
restructure	O
after	O
version	O
8	O
.	O
</s>
<s>
The	O
program	O
is	O
a	O
recompilation	O
of	O
4OS2	B-Application
,	O
and	O
continues	O
to	O
have	O
features	O
of	O
OS/2	B-Application
'	O
s	O
command	O
processor	O
(	O
cmd.exe	B-Device
)	O
,	O
such	O
as	O
running	O
REXX	B-Language
scripts	O
,	O
and	O
EXTPROC	O
support	O
.	O
</s>
<s>
A	O
corresponding	O
Take	B-Application
Command/32	I-Application
exists	O
for	O
this	O
,	O
version	O
1	O
corresponding	O
to	O
4NT	B-Application
2.5	O
.	O
</s>
<s>
4NT	B-Application
and	O
Take	B-Application
Command/32	I-Application
were	O
released	O
in	O
both	O
ANSI	O
(	O
Windows	B-Application
9x	O
)	O
and	O
Unicode	O
(	O
Windows	B-Device
NT	I-Device
)	O
forms	O
,	O
with	O
the	O
ANSI	O
version	O
dropped	O
at	O
version	O
5	O
.	O
</s>
<s>
A	O
new	O
Win32	O
program	O
Tabbed	O
Command	O
Interface	O
(	O
TCI	O
)	O
,	O
was	O
released	O
at	O
the	O
time	O
of	O
4NT	B-Application
version	O
7	O
.	O
</s>
<s>
This	O
program	O
requires	O
Windows	B-Application
XP	I-Application
or	O
later	O
.	O
</s>
<s>
A	O
new	O
version	O
of	O
Take	B-Application
Command	I-Application
extends	O
the	O
original	O
Tabbed	O
Command	O
Interface	O
,	O
expanded	O
with	O
extra	O
windows	B-Application
to	O
allow	O
input	O
to	O
be	O
composed	O
,	O
to	O
graphically	O
navigate	O
directories	O
and	O
files	O
,	O
and	O
extra	O
features	O
.	O
</s>
<s>
4NT	B-Application
is	O
bundled	O
as	O
Take	B-Application
Command	I-Application
Console	I-Application
.	O
</s>
<s>
JP	B-Application
Software	I-Application
then	O
released	O
:	O
</s>
<s>
This	O
has	O
been	O
released	O
from	O
versions	O
9	O
to	O
12.1	O
,	O
corresponding	O
to	O
the	O
underlying	O
4NT/TCC	O
version	O
.	O
</s>
<s>
4DOS	B-Application
features	O
a	O
number	O
of	O
enhancements	O
compared	O
to	O
COMMAND.COM	B-Operating_System
:	O
</s>
<s>
Originally	O
distributed	O
as	O
shareware	B-License
,	O
4DOS	B-Application
has	O
been	O
later	O
released	O
as	O
unsupported	O
freeware	B-License
.	O
</s>
<s>
Currently	O
,	O
the	O
source	O
code	O
is	O
available	O
under	O
a	O
modified	O
MIT	B-License
License	I-License
but	O
it	O
"	O
may	O
not	O
be	O
used	O
in	O
any	O
commercial	O
product	O
without	O
written	O
permission	O
from	O
Rex	B-Application
C	I-Application
.	I-Application
Conn	I-Application
"	O
and	O
"	O
may	O
not	O
be	O
compiled	O
for	O
use	O
on	O
any	O
operating	O
system	O
other	O
than	O
FreeDOS	B-Application
"	O
-	O
so	O
does	O
not	O
qualify	O
as	O
open	O
source	O
as	O
defined	O
by	O
Open	O
Source	O
Initiative	O
.	O
</s>
<s>
The	O
last	O
update	O
by	O
JP	B-Application
Software	I-Application
was	O
version	O
7.50.130	O
,	O
released	O
in	O
August	O
2004	O
.	O
</s>
<s>
During	O
its	O
15-year	O
history	O
,	O
4DOS	B-Application
underwent	O
numerous	O
updates	O
;	O
here	O
are	O
a	O
few	O
of	O
the	O
most	O
significant	O
.	O
</s>
<s>
Improved	O
command-line	O
editing	O
,	O
filename	O
completion	O
,	O
command	B-Application
history	I-Application
,	O
aliases	B-Device
,	O
improved	O
wildcards	B-Algorithm
,	O
online	O
help	O
,	O
internal	O
variables	O
,	O
swapping	O
to	O
disk	O
or	O
EMS	B-Device
,	O
file	O
descriptions	O
,	O
command	O
separator	O
,	O
key	O
stacker	O
.	O
</s>
<s>
3.00	O
1990-03-07	O
BTM	O
batch	O
files	O
(	O
cached	O
to	O
memory	O
for	O
speed	O
)	O
,	O
extended	B-Device
memory	I-Device
(	O
XMS	O
)	O
swapping	O
,	O
variable	O
functions	O
,	O
bracket	O
variable-name	O
syntax	O
.	O
</s>
<s>
4.00	O
1991-11-01	O
Colored	O
directory	O
listings	O
,	O
4DOS.INI	B-Application
configuration	O
file	O
,	O
include	O
lists	O
,	O
command	O
groups	O
,	O
implied	O
CDD	O
,	O
DOS	B-Device
5	O
Upper	B-Device
Memory	I-Device
Blocks	I-Device
(	O
UMB	O
)	O
support	O
.	O
</s>
<s>
5.51	O
1995-08-22	O
Long	O
filename	O
support	O
,	O
REXX	B-Language
in	O
.BAT	O
files	O
(	O
as	O
in	O
PC	O
DOS	B-Device
7.0	O
)	O
.	O
</s>
<s>
6.00	O
1997-07-24	O
Extended	O
directory	O
searches	O
,	O
interactive	O
configuration	O
(	O
OPTION	O
command	O
)	O
,	O
exclusion	O
ranges	O
,	O
interactive	O
batch	O
file	O
debugger.7.00	O
2001-06-18	O
@file	O
lists	O
(	O
as	O
in	O
DR-DOS	B-Application
)	O
.7.50	O
2003-02-24	O
User-defined	O
functions.7.50.1	O
2006-11-13	O
Open	O
source	O
version	O
of	O
7.50	O
.	O
</s>
<s>
Luchezar	O
Georgiev	O
and	O
Jaelani	O
Utomo	O
have	O
continued	O
developing	O
4DOS.8.00	O
2009-02-27	O
Latest	O
version	O
.	O
</s>
<s>
Some	O
versions	O
of	O
the	O
Norton	B-Application
Utilities	I-Application
for	O
DOS	B-Device
included	O
modified	O
copies	O
of	O
4DOS	B-Application
called	O
NDOS	O
.	O
</s>
<s>
The	O
last	O
version	O
of	O
NDOS	O
was	O
bundled	O
with	O
Norton	B-Application
Utilities	I-Application
8	O
,	O
and	O
corresponded	O
to	O
4DOS	B-Application
4.03	O
.	O
</s>
