<s>
PostScript	B-Language
Printer	I-Language
Description	I-Language
(	O
PPD	O
)	O
files	O
are	O
created	O
by	O
vendors	O
to	O
describe	O
the	O
entire	O
set	O
of	O
features	O
and	O
capabilities	O
available	O
for	O
their	O
PostScript	B-Language
printers	O
.	O
</s>
<s>
A	O
PPD	O
also	O
contains	O
the	O
PostScript	B-Language
code	O
(	O
commands	O
)	O
used	O
to	O
invoke	O
features	O
for	O
the	O
print	B-General_Concept
job	I-General_Concept
.	O
</s>
<s>
As	O
such	O
,	O
PPDs	O
function	O
as	O
drivers	O
for	O
all	O
PostScript	B-Language
printers	O
,	O
by	O
providing	O
a	O
unified	O
interface	O
for	O
the	O
printer	O
's	O
capabilities	O
and	O
features	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
generic	O
PPD	B-Language
file	I-Language
for	O
all	O
models	O
of	O
HP	O
Color	O
LaserJet	O
contains	O
:	O
</s>
<s>
which	O
specifies	O
that	O
the	O
printer	O
understands	O
PostScript	B-Language
Level	O
2	O
,	O
is	O
a	O
color	O
device	O
,	O
and	O
so	O
forth	O
.	O
</s>
<s>
A	O
PPD	O
is	O
also	O
often	O
called	O
PostScript	B-Language
Page	O
Description	O
instead	O
of	O
Printer	O
Description	O
,	O
this	O
is	O
because	O
PostScript	B-Language
has	O
the	O
concept	O
of	O
Page	O
Devices	O
where	O
the	O
PostScript	B-Language
page	O
description	O
configuration	O
is	O
read	O
from	O
or	O
saved	O
as	O
a	O
PPD	B-Language
file	I-Language
.	O
</s>
<s>
CUPS	O
uses	O
PPD	O
drivers	O
for	O
all	O
of	O
its	O
PostScript	B-Language
printers	O
,	O
and	O
has	O
even	O
extended	O
the	O
concept	O
to	O
allow	O
for	O
PostScript	B-Language
printing	O
to	O
non-PostScript	O
printing	O
devices	O
,	O
by	O
directing	O
output	O
through	O
a	O
CUPS	O
filter	O
.	O
</s>
<s>
CUPS	O
clients	O
usually	O
read	O
the	O
current	O
PPD	B-Language
file	I-Language
from	O
the	O
server	O
every	O
time	O
a	O
new	O
print	B-General_Concept
job	I-General_Concept
is	O
created	O
.	O
</s>
<s>
Microsoft	B-Application
Windows	I-Application
also	O
uses	O
PPD	B-Language
files	I-Language
but	O
converts	O
these	O
to	O
a	O
binary	O
.BPD	O
file	O
format	O
before	O
using	O
them	O
.	O
</s>
<s>
Updating	O
a	O
PPD	B-Language
file	I-Language
requires	O
four	O
steps	O
:	O
</s>
<s>
edit	O
the	O
existing	O
PPD	B-Language
file	I-Language
in	O
place	O
or	O
replace	O
it	O
by	O
an	O
updated	O
version	O
;	O
</s>
