<s>
FVWM-Crystal	B-Application
is	O
a	O
theme	B-Application
framework	O
for	O
the	O
FVWM	B-Device
window	B-Application
manager	I-Application
.	O
</s>
<s>
It	O
uses	O
GUI	B-Application
tools	O
to	O
edit	O
the	O
look	O
of	O
windows	O
,	O
instead	O
of	O
the	O
use	O
of	O
editing	O
a	O
text	O
file	O
in	O
FVWM	B-Device
.	O
</s>
<s>
It	O
creates	O
a	O
desktop	O
environment	O
using	O
FVWM	B-Device
as	O
its	O
window	B-Application
manager	I-Application
and	O
main	O
core	O
.	O
</s>
<s>
It	O
features	O
flexible	O
window	O
decorations	O
,	O
and	O
a	O
file	B-Application
manager	I-Application
may	O
be	O
optionally	O
used	O
to	O
display	O
desktop	O
icons	O
;	O
ROX-Filer	B-Language
,	O
Thunar	B-Language
and	O
Nautilus	B-Language
are	O
supported	O
for	O
this	O
task	O
.	O
</s>
<s>
FVWM-Crystal	B-Application
offers	O
user	B-Application
interface	I-Application
integration	O
for	O
some	O
terminal	B-Application
emulators	I-Application
like	O
xterm	B-Language
,	O
aterm	O
and	O
urxvt	O
(	O
rxvt-unicode	O
)	O
,	O
for	O
a	O
tray	O
system	O
such	O
as	O
stalonetray	O
or	O
trayer-srg	O
,	O
for	O
various	O
music	O
players	O
-	O
among	O
them	O
Audacious	B-Language
,	O
MPD	B-Language
,	O
Quod	B-Language
Libet	I-Language
,	O
XMMS	B-Language
and	O
XMMS2	O
-	O
and	O
for	O
the	O
video/audio	O
player	O
MPlayer	B-Application
,	O
to	O
the	O
point	O
where	O
it	O
can	O
control	O
these	O
components	O
.	O
</s>
<s>
FVWM-Crystal	B-Application
makes	O
use	O
of	O
semi-transparency	O
.	O
</s>
<s>
By	O
additionally	O
installing	O
a	O
utility	O
program	O
such	O
as	O
transset-df	O
the	O
semi-transparency	O
can	O
be	O
switched	O
on	O
or	O
off	O
via	O
pressing	O
a	O
determined	O
key	O
of	O
the	O
keyboard	B-Device
,	O
being	O
chosen	O
in	O
accordance	O
with	O
user	O
's	O
demands	O
.	O
</s>
<s>
There	O
is	O
also	O
a	O
menu	O
system	O
that	O
has	O
an	O
extensive	O
default	O
configuration	B-General_Concept
but	O
may	O
be	O
customized	O
and	O
extended	O
by	O
each	O
user	O
to	O
fit	O
personal	O
requirements	O
.	O
</s>
<s>
The	O
deep-level	O
configuration	B-General_Concept
of	O
the	O
resulting	O
desktop	O
environment	O
is	O
predominantly	O
achieved	O
via	O
Python	B-Language
scripts	I-Language
.	O
</s>
<s>
Chief	O
developers	O
of	O
FVWM-Crystal	B-Application
are	O
Maciej	O
Delmanowski	O
and	O
Dominique	O
Michel	O
.	O
</s>
