<s>
Graffiti	B-Application
is	O
an	O
essentially	O
single-stroke	O
shorthand	O
handwriting	B-Application
recognition	I-Application
system	I-Application
used	O
in	O
PDAs	B-Application
based	O
on	O
the	O
Palm	B-Operating_System
OS	I-Operating_System
.	O
</s>
<s>
Graffiti	B-Application
was	O
originally	O
written	O
by	O
Palm	O
,	O
Inc	O
.	O
as	O
the	O
recognition	O
system	O
for	O
GEOS-based	O
devices	O
such	O
as	O
HP	O
's	O
OmniGo	B-Device
100	I-Device
and	O
120	O
or	O
the	O
Magic	O
Cap-line	O
and	O
was	O
available	O
as	O
an	O
alternate	O
recognition	O
system	O
for	O
the	O
Apple	B-Device
Newton	I-Device
MessagePad	O
,	O
when	O
NewtonOS	O
1.0	O
could	O
not	O
recognize	O
handwriting	O
very	O
well	O
.	O
</s>
<s>
Graffiti	B-Application
also	O
runs	O
on	O
the	O
Windows	B-Operating_System
Mobile	I-Operating_System
platform	O
,	O
where	O
it	O
is	O
called	O
"	O
Block	O
Recognizer	O
"	O
,	O
and	O
on	O
the	O
Symbian	B-Operating_System
UIQ	B-Language
platform	O
as	O
the	O
default	O
recognizer	O
and	O
was	O
available	O
for	O
Casio	O
's	O
Zoomer	O
PDA	B-Application
.	O
</s>
<s>
Graffiti	B-Application
was	O
developed	O
by	O
Jeff	O
Hawkins	O
,	O
who	O
had	O
previously	O
created	O
"	O
PalmPrint	O
"	O
(	O
the	O
character	O
recognition	O
system	O
used	O
by	O
the	O
Casio	O
Zoomer	O
)	O
to	O
recognize	O
natural	O
handwriting	O
.	O
</s>
<s>
Hawkins	O
believed	O
that	O
people	O
would	O
take	O
the	O
time	O
to	O
learn	O
Graffiti	B-Application
just	O
as	O
people	O
learn	O
to	O
touch-type	B-Device
.	O
</s>
<s>
Touch-typing	B-Device
is	O
a	O
skill	O
you	O
learn.	O
"	O
</s>
<s>
Joe	O
Sipher	O
and	O
Ron	O
Marianetti	O
created	O
more	O
characters	O
and	O
punctuation	O
and	O
also	O
designed	O
a	O
prototype	O
of	O
Graffiti	B-Application
that	O
ran	O
on	O
a	O
PC	O
with	O
a	O
tablet	B-Device
peripheral	I-Device
.	O
</s>
<s>
Graffiti	B-Application
was	O
also	O
implemented	O
on	O
the	O
Apple	B-Device
Newton	I-Device
.	O
</s>
<s>
In	O
2008	O
,	O
an	O
unauthorized	O
version	O
of	O
Graffiti	B-Application
was	O
introduced	O
for	O
iOS	B-Operating_System
(	O
iPhone	B-Device
and	O
iPad	B-Device
)	O
devices	O
.	O
</s>
<s>
An	O
Android	B-Application
version	O
was	O
released	O
in	O
2010	O
by	O
ACCESS	O
Co.	O
,	O
Ltd	O
.	O
of	O
Japan	O
,	O
which	O
acquired	O
the	O
rights	O
to	O
Graffiti	B-Application
when	O
it	O
acquired	O
PalmSource	O
,	O
Inc	O
.	O
in	O
2005	O
.	O
</s>
<s>
The	O
original	O
Graffiti	B-Application
system	O
was	O
the	O
subject	O
of	O
a	O
lawsuit	O
from	O
Xerox	O
,	O
claiming	O
it	O
violated	O
Xerox	O
's	O
patent	O
relating	O
to	O
its	O
Unistrokes	O
technology	O
(	O
,	O
granted	O
in	O
1997	O
)	O
.	O
</s>
