<s>
gPXE	B-Device
is	O
an	O
open-source	B-Application
Preboot	B-Device
eXecution	I-Device
Environment	I-Device
(	O
PXE	B-Device
)	O
client	O
firmware	O
implementation	O
and	O
bootloader	B-Application
derived	O
from	O
Etherboot	B-Device
.	O
</s>
<s>
It	O
can	O
be	O
used	O
to	O
enable	O
computers	O
without	O
built-in	O
PXE	B-Device
support	O
to	O
boot	O
from	O
the	O
network	O
,	O
or	O
to	O
extend	O
an	O
existing	O
client	O
PXE	B-Device
implementation	O
with	O
support	O
for	O
additional	O
protocols	O
.	O
</s>
<s>
While	O
standard	O
PXE	B-Device
clients	O
use	O
TFTP	B-Device
to	O
transfer	O
data	O
,	O
gPXE	B-Device
client	O
firmware	O
adds	O
the	O
ability	O
to	O
retrieve	O
data	O
through	O
other	O
protocols	O
like	O
HTTP	B-Protocol
,	O
iSCSI	B-Protocol
and	O
ATA	B-Protocol
over	I-Protocol
Ethernet	I-Protocol
(	O
AoE	O
)	O
,	O
and	O
can	O
work	O
with	O
Wi-Fi	O
rather	O
than	O
requiring	O
a	O
wired	O
connection	O
.	O
</s>
<s>
gPXE	B-Device
development	O
ceased	O
in	O
summer	O
2010	O
,	O
and	O
several	O
projects	O
are	O
migrating	O
or	O
considering	O
migrating	O
to	O
iPXE	B-Device
as	O
a	O
result	O
.	O
</s>
<s>
gPXE	B-Device
can	O
be	O
loaded	O
by	O
a	O
computer	O
in	O
several	O
ways	O
:	O
</s>
<s>
gPXE	B-Device
implements	O
its	O
own	O
PXE	B-Device
stack	O
,	O
using	O
a	O
driver	O
corresponding	O
to	O
the	O
network	O
card	O
,	O
or	O
a	O
UNDI	B-Device
driver	O
if	O
it	O
was	O
loaded	O
by	O
PXE	B-Device
itself	O
.	O
</s>
<s>
This	O
allows	O
to	O
use	O
a	O
PXE	B-Device
stack	O
even	O
if	O
the	O
network	O
card	O
has	O
no	O
boot	O
ROM	B-Device
,	O
by	O
loading	O
gPXE	B-Device
from	O
a	O
fixed	O
medium	O
.	O
</s>
<s>
Although	O
its	O
basic	O
role	O
was	O
to	O
implement	O
a	O
PXE	B-Device
stack	O
,	O
gPXE	B-Device
can	O
be	O
used	O
as	O
a	O
full-featured	O
network	O
bootloader	B-Application
.	O
</s>
<s>
It	O
can	O
fetch	O
files	O
from	O
multiple	O
network	O
protocols	O
,	O
such	O
as	O
TFTP	B-Device
,	O
NFS	B-Protocol
,	O
HTTP	B-Protocol
or	O
FTP	B-Protocol
,	O
and	O
can	O
boot	O
PXE	B-Device
,	O
ELF	O
,	O
Linux	B-Operating_System
,	O
FreeBSD	B-Operating_System
,	O
multiboot	O
,	O
EFI	B-Architecture
,	O
NBI	B-Device
and	O
Windows	B-Operating_System
CE	I-Operating_System
images	O
.	O
</s>
<s>
In	O
addition	O
,	O
it	O
is	O
scriptable	O
and	O
can	O
load	O
COMBOOT	O
and	O
COM32	O
SYSLINUX	B-Application
extensions	O
.	O
</s>
