<s>
BootSkin	B-Application
is	O
a	O
computer	B-Application
program	I-Application
for	O
Microsoft	B-Application
Windows	I-Application
2000	I-Application
,	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Vista	I-Application
that	O
allows	O
users	O
to	O
change	O
the	O
screen	O
displayed	O
while	O
the	O
operating	B-General_Concept
system	I-General_Concept
is	O
booting	O
.	O
</s>
<s>
It	O
is	O
made	O
by	O
Stardock	O
,	O
and	O
distributed	O
for	O
free	O
under	O
the	O
WinCustomize	B-Application
brand	O
.	O
</s>
<s>
BootSkin	B-Application
uses	O
a	O
boot-time	O
device	B-Application
driver	I-Application
(	O
vidstub.sys	O
)	O
to	O
access	O
the	O
display	O
directly	O
using	O
VESA	B-Device
BIOS	I-Device
Extensions	I-Device
(	O
VBE	B-Device
)	O
,	O
unlike	O
other	O
bootscreen	O
changers	O
which	O
alter	O
the	O
boot	O
screen	O
image	O
inside	O
the	O
kernel	B-Operating_System
.	O
</s>
<s>
This	O
has	O
the	O
advantage	O
of	O
not	O
modifying	O
system	O
files	O
,	O
and	O
makes	O
higher-resolution	O
boot	O
screens	O
possible	O
;	O
standard	O
boot	O
screens	O
are	O
limited	O
to	O
640x480	O
with	O
16	O
colors	O
.	O
</s>
<s>
Some	O
graphics	B-Device
cards	I-Device
and	O
chipsets	B-Device
do	O
not	O
support	O
VBE	B-Device
well	O
,	O
preventing	O
their	O
use	O
with	O
BootSkin	B-Application
.	O
</s>
<s>
Successful	O
skins	O
tend	O
to	O
take	O
advantage	O
of	O
the	O
limitations	O
through	O
the	O
use	O
of	O
a	O
limited	O
palette	B-Data_Structure
and	O
dithering	O
.	O
</s>
