<s>
Vttest	B-Device
is	O
an	O
application	O
that	O
is	O
used	O
to	O
demonstrate	O
features	O
of	O
VT100	B-Device
and	O
related	O
terminals	O
,	O
or	O
emulations	O
thereof	O
,	O
such	O
as	O
xterm	B-Language
.	O
</s>
<s>
It	O
has	O
been	O
maintained	O
and	O
extended	O
since	O
1996	O
by	O
Thomas	B-Application
Dickey	I-Application
,	O
to	O
test	O
and	O
demonstrate	O
features	O
of	O
xterm	B-Language
.	O
</s>
<s>
The	O
newer	O
version	O
has	O
always	O
been	O
distributed	O
as	O
a	O
separate	O
program	O
;	O
older	O
versions	O
have	O
been	O
bundled	O
with	O
other	O
software	O
,	O
e.g.	O
,	O
terminal	B-Application
emulators	I-Application
such	O
as	O
Rxvt	B-Application
,	O
Konsole	B-Language
,	O
and	O
the	O
FreeBSD	O
PCVT	O
.	O
</s>
<s>
Perhaps	O
prompted	O
by	O
the	O
"	O
scoresheet	O
"	O
presented	O
by	O
the	O
developers	O
of	O
Kermit	B-Protocol
,	O
some	O
other	O
developers	O
of	O
terminal	B-Application
emulators	I-Application
have	O
asserted	O
that	O
their	O
product	O
achieves	O
a	O
given	O
rating	O
on	O
the	O
"	O
VTTEST	B-Device
Score	O
Card	O
"	O
.	O
</s>
<s>
However	O
,	O
no	O
independent	O
verification	B-Application
of	O
any	O
of	O
those	O
claims	O
exists	O
.	O
</s>
