<s>
Vtwm	B-Device
(	O
the	O
Virtual	O
Tabbed	O
Window	O
Manager	O
)	O
is	O
an	O
X	B-Application
window	I-Application
manager	I-Application
that	O
was	O
developed	O
from	O
the	O
twm	B-Language
codebase	O
.	O
</s>
<s>
It	O
added	O
features	O
like	O
xpm	O
icons	O
,	O
autoraising	O
of	O
windows	O
,	O
and	O
a	O
virtual	B-Application
desktop	I-Application
;	O
the	O
latter	O
feature	O
is	O
from	O
where	O
the	O
program	O
takes	O
its	O
name	O
.	O
</s>
<s>
Later	O
additions	O
include	O
playing	O
sounds	O
in	O
response	O
to	O
window	O
manager	O
events	O
,	O
and	O
Motif-style	O
window	O
decorations	O
in	O
place	O
of	O
the	O
"	O
flat	O
,	O
"	O
2D	O
titlebars	O
commonly	O
associated	O
with	O
twm	B-Language
.	O
</s>
<s>
Vtwm	B-Device
was	O
one	O
of	O
the	O
first	O
window	O
managers	O
to	O
have	O
an	O
icon	O
manager	O
,	O
a	O
box	O
of	O
clickable	O
windows	O
which	O
mapped	O
to	O
the	O
application	O
windows	O
currently	O
on	O
the	O
desktop	O
.	O
</s>
<s>
Vtwm	B-Device
is	O
released	O
under	O
the	B-License
MIT	I-License
license	I-License
.	O
</s>
<s>
Other	O
features	O
of	O
twm	B-Language
,	O
including	O
shaped	O
window	O
titlebars	O
,	O
are	O
faithfully	O
incorporated	O
into	O
vtwm	B-Device
.	O
</s>
<s>
The	O
focus	O
of	O
vtwm	B-Device
is	O
to	O
maintain	O
simplicity	O
and	O
compatibility	O
.	O
</s>
<s>
It	O
is	O
believed	O
to	O
still	O
work	O
under	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
revision	O
4	O
,	O
and	O
can	O
be	O
compiled	O
and	O
run	O
with	O
no	O
dependencies	O
beyond	O
the	O
standard	O
X	B-Language
libraries	I-Language
.	O
</s>
