<s>
Driver	B-Application
Verifier	I-Application
is	O
a	O
tool	O
included	O
in	O
Microsoft	B-Application
Windows	I-Application
that	O
replaces	O
the	O
default	O
operating	O
system	O
subroutines	O
with	O
ones	O
that	O
are	O
specifically	O
developed	O
to	O
catch	O
device	B-Application
driver	I-Application
bugs	B-Error_Name
.	O
</s>
<s>
It	O
acts	O
within	O
the	O
kernel	O
mode	O
and	O
can	O
target	O
specific	O
device	B-Application
drivers	I-Application
for	O
continual	O
checking	O
or	O
make	O
driver	B-Application
verifier	I-Application
functionality	O
multithreaded	B-Operating_System
,	O
so	O
that	O
several	O
device	B-Application
drivers	I-Application
can	O
be	O
stressed	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
It	O
can	O
simulate	O
certain	O
conditions	O
such	O
as	O
low	O
memory	O
,	O
I/O	B-General_Concept
verification	O
,	O
pool	B-General_Concept
tracking	O
,	O
IRQL	O
checking	O
,	O
deadlock	B-Operating_System
detection	O
,	O
DMA	B-General_Concept
checks	O
,	O
IRP	B-Device
logging	O
,	O
etc	O
.	O
</s>
<s>
Typically	O
fatal	O
system	O
errors	O
are	O
generated	O
by	O
the	O
stressed	O
drivers	O
in	O
the	O
test	O
environment	O
,	O
producing	O
core	B-Error_Name
dumps	I-Error_Name
that	O
can	O
be	O
analysed	O
and	O
debugged	O
immediately	O
;	O
without	O
stressing	O
,	O
intermittent	O
faults	O
would	O
occur	O
in	O
the	O
field	O
,	O
without	O
proper	O
troubleshooting	O
facilities	O
or	O
personnel	O
.	O
</s>
<s>
Driver	B-Application
Verifier	I-Application
(	O
Verifier.exe	O
)	O
was	O
first	O
introduced	O
as	O
a	O
command-line	O
utility	O
in	O
Windows	B-Application
2000	I-Application
;	O
in	O
Windows	B-Application
XP	I-Application
,	O
it	O
gained	O
an	O
easy-to-use	O
graphical	O
user	O
interface	O
,	O
called	O
Driver	B-Application
Verifier	I-Application
Manager	O
,	O
that	O
makes	O
it	O
possible	O
to	O
enable	O
a	O
standard	O
or	O
custom	O
set	O
of	O
settings	O
to	O
select	O
which	O
drivers	O
to	O
test	O
and	O
verify	O
.	O
</s>
<s>
Driver	B-Application
Verifier	I-Application
is	O
not	O
normally	O
used	O
on	O
machines	O
used	O
in	O
productive	O
work	O
.	O
</s>
