<s>
twm	B-Language
(	O
Tab	B-Language
Window	I-Language
Manager	I-Language
)	O
is	O
a	O
window	B-Application
manager	I-Application
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
Started	O
in	O
1987	O
by	O
Tom	B-Language
LaStrange	I-Language
,	O
it	O
has	O
been	O
the	O
standard	O
window	B-Application
manager	I-Application
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
since	O
version	O
X11R4	B-Operating_System
.	O
</s>
<s>
The	O
name	O
originally	O
stood	O
for	O
Tom	B-Language
's	I-Language
Window	I-Language
Manager	I-Language
,	O
but	O
the	O
software	O
was	O
renamed	O
Tab	B-Language
Window	I-Language
Manager	I-Language
by	O
the	O
X	B-Operating_System
Consortium	O
when	O
they	O
adopted	O
it	O
in	O
1989	O
.	O
twm	B-Language
is	O
a	O
stacking	B-Device
window	I-Device
manager	I-Device
that	O
provides	O
title	O
bars	O
,	O
shaped	O
windows	O
and	O
icon	O
management	O
.	O
</s>
<s>
twm	B-Language
was	O
a	O
breakthrough	O
achievement	O
in	O
the	O
early	O
years	O
,	O
but	O
has	O
been	O
largely	O
superseded	O
by	O
other	O
window	O
managers	O
,	O
which	O
unlike	O
twm	B-Language
,	O
use	O
a	O
widget	B-Library
toolkit	I-Library
rather	O
than	O
writing	O
directly	O
against	O
Xlib	B-Language
.	O
</s>
<s>
Various	O
other	O
window	O
managers	O
—	O
such	O
as	O
vtwm	B-Device
,	O
tvtwm	B-Device
,	O
CTWM	B-Device
,	O
and	O
FVWM	B-Device
—	O
were	O
built	O
on	O
twm	B-Language
's	O
source	O
code	O
.	O
</s>
<s>
twm	B-Language
is	O
still	O
standard	O
with	O
X.Org	B-Operating_System
Server	I-Operating_System
,	O
and	O
is	O
available	O
as	O
part	O
of	O
many	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
implementations	O
.	O
</s>
<s>
twm	B-Language
's	O
interface	O
is	O
different	O
from	O
modern	O
common	O
X	B-Application
window	I-Application
managers	I-Application
and	O
desktop	O
environments	O
many	O
of	O
which	O
tend	O
to	O
work	O
similarly	O
to	O
the	O
Apple	B-Device
Macintosh	I-Device
or	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
New	O
users	O
often	O
find	O
twm	B-Language
difficult	O
without	O
reading	O
the	O
manual	B-Protocol
page	I-Protocol
.	O
</s>
<s>
In	O
the	O
default	O
configuration	O
of	O
twm	B-Language
,	O
the	O
title	O
bar	O
has	O
two	O
buttons	O
:	O
</s>
<s>
Resize	O
button	O
(	O
nested	O
squares	O
)	O
:	O
the	O
user	O
clicks	O
here	O
,	O
drags	O
the	O
mouse	B-Device
pointer	O
to	O
the	O
edge	O
to	O
be	O
moved	O
,	O
then	O
releases	O
when	O
the	O
window	O
is	O
the	O
desired	O
size	O
.	O
</s>
<s>
Window	O
focus	B-Application
follows	O
the	O
mouse	B-Device
pointer	O
(	O
point-to-focus	O
)	O
,	O
rather	O
than	O
being	O
on	O
whichever	O
window	O
was	O
clicked	O
last	O
(	O
click-to-focus	B-Application
)	O
.	O
</s>
<s>
When	O
a	O
new	O
window	O
is	O
created	O
,	O
a	O
3×3	O
grid	O
is	O
displayed	O
following	O
the	O
mouse	B-Device
pointer	O
,	O
waiting	O
for	O
the	O
user	O
to	O
click	O
where	O
the	O
window	O
should	O
appear	O
—	O
left-click	O
to	O
appear	O
in	O
that	O
position	O
with	O
that	O
size	O
,	O
middle-click	O
to	O
resize	O
the	O
window	O
before	O
its	O
creation	O
,	O
right-click	O
to	O
appear	O
at	O
that	O
position	O
but	O
long	O
enough	O
vertically	O
to	O
reach	O
the	O
bottom	O
of	O
the	O
screen	O
.	O
</s>
<s>
twm	B-Language
was	O
written	O
as	O
a	O
replacement	O
for	O
the	O
uwm	B-Device
by	O
Tom	B-Language
LaStrange	I-Language
while	O
he	O
was	O
working	O
at	O
Evans	O
&	O
Sutherland	O
,	O
which	O
was	O
part	O
of	O
the	O
X	B-Operating_System
Consortium	O
:	O
"	O
I	O
sat	O
down	O
at	O
my	O
monochrome	O
Sun	B-Device
3/50	I-Device
and	O
typed	O
vi	B-Application
twm.c	O
and	O
then	O
opened	O
the	O
X11	B-Operating_System
documentation	O
.	O
</s>
<s>
twm	B-Language
was	O
my	O
first	O
X	B-Operating_System
program	O
.	O
</s>
<s>
About	O
six	O
months	O
later	O
,	O
I	O
convinced	O
my	O
manager	O
to	O
let	O
me	O
send	O
a	O
copy	O
to	O
the	O
comp.windows.x	O
newsgroup	O
for	O
testing.	O
"	O
</s>
<s>
Months	O
later	O
,	O
Jim	O
Fulton	O
of	O
the	O
X	B-Operating_System
Consortium	O
(	O
which	O
was	O
at	O
the	O
time	O
part	O
of	O
MIT	O
)	O
approached	O
Evans	O
and	O
Sutherland	O
and	O
asked	O
them	O
to	O
turn	O
over	O
the	O
code	O
maintenance	O
to	O
the	O
X	B-Operating_System
Consortium	O
and	O
Fulton	O
then	O
made	O
it	O
compliant	O
with	O
the	O
nascent	O
Inter-Client	B-Operating_System
Communication	I-Operating_System
Conventions	I-Operating_System
Manual	I-Operating_System
.	O
</s>
<s>
Subsequently	O
,	O
twm	B-Language
was	O
released	O
as	O
the	O
standard	O
sample	O
window	B-Application
manager	I-Application
for	O
X11R4	B-Operating_System
,	O
replacing	O
uwm	B-Device
.	O
</s>
<s>
twm	B-Language
was	O
originally	O
written	O
by	O
Tom	B-Language
LaStrange	I-Language
.	O
</s>
<s>
Later	O
contributors	O
include	O
Jim	O
Fulton	O
,	O
Keith	O
Packard	O
and	O
Dave	O
Sternlicht	O
,	O
all	O
of	O
whom	O
were	O
employees	O
of	O
the	O
X	B-Operating_System
Consortium	O
.	O
</s>
