<s>
VPSKeys	B-Application
is	O
a	O
freeware	B-License
input	B-General_Concept
method	I-General_Concept
editor	I-General_Concept
developed	O
and	O
distributed	O
by	O
the	O
Vietnamese	O
Professionals	O
Society	O
(	O
VPS	O
)	O
.	O
</s>
<s>
One	O
of	O
the	O
first	O
input	B-General_Concept
method	I-General_Concept
editors	I-General_Concept
for	O
Vietnamese	O
,	O
it	O
allows	O
users	O
to	O
add	O
accent	O
marks	O
to	O
Vietnamese	O
text	O
on	O
computers	O
running	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
The	O
first	O
version	O
of	O
VPSKeys	B-Application
,	O
supporting	O
Windows	O
3.1	O
,	O
was	O
released	O
in	O
1993	O
.	O
</s>
<s>
VPSKeys	B-Application
supports	O
the	O
Telex	O
,	O
VISCII	O
,	O
VNI	O
,	O
and	O
VIQR	O
input	B-General_Concept
methods	I-General_Concept
,	O
as	O
well	O
as	O
a	O
number	O
of	O
character	B-General_Concept
encodings	I-General_Concept
.	O
</s>
<s>
One	O
of	O
its	O
unique	O
features	O
is	O
a	O
"	O
hook/tilde	O
dictionary	O
"	O
(	O
)	O
,	O
which	O
provides	O
spelling	B-Application
suggestions	I-Application
for	O
distinguishing	O
words	O
with	O
or	O
tones	O
.	O
</s>
<s>
The	O
"	O
VPS	O
"	O
character	B-General_Concept
encoding	I-General_Concept
for	O
writing	O
Vietnamese	O
replaces	O
several	O
control	O
characters	O
,	O
including	O
several	O
C0	O
control	O
characters	O
,	O
with	O
letters	O
while	O
including	O
the	O
ASCII	B-Protocol
graphical	O
characters	O
unmodified	O
,	O
a	O
similar	O
approach	O
to	O
VSCII-1	O
(	O
TCVN1	O
)	O
and	O
VISCII	O
.	O
</s>
<s>
In	O
March	O
2010	O
,	O
Google	B-Application
and	O
McAfee	O
announced	O
on	O
their	O
security	O
blogs	O
that	O
they	O
believe	O
that	O
hackers	O
compromised	O
the	O
VPS	O
website	O
and	O
replaced	O
the	O
program	O
with	O
a	O
trojan	O
.	O
</s>
<s>
The	O
trojan	O
,	O
which	O
McAfee	O
has	O
code-named	O
W32/VulcanBot	B-Application
,	O
creates	O
a	O
botnet	B-Architecture
that	O
could	O
be	O
used	O
to	O
launch	O
distributed	O
denial	O
of	O
service	O
attacks	O
on	O
websites	O
critical	O
of	O
the	O
Vietnamese	O
government	O
's	O
plan	O
to	O
mine	O
bauxite	O
in	O
the	O
country	O
's	O
Central	O
Highlands	O
.	O
</s>
<s>
The	O
Vietnamese	O
Ministry	O
of	O
Foreign	O
Affairs	O
issued	O
a	O
statement	O
calling	O
Google	B-Application
's	I-Application
and	O
McAfee	O
's	O
comments	O
"	O
groundless	O
"	O
.	O
</s>
