<s>
In	O
open	B-Operating_System
systems	I-Operating_System
,	O
a	O
virtual	B-Application
terminal	I-Application
(	O
VT	O
)	O
is	O
an	O
application	B-Application
service	I-Application
that	O
:	O
</s>
<s>
Allows	O
host	B-Application
terminals	O
on	O
a	O
multi-user	O
network	B-Architecture
to	O
interact	O
with	O
other	O
hosts	O
regardless	O
of	O
terminal	B-General_Concept
type	O
and	O
characteristics	O
,	O
</s>
<s>
Allows	O
remote	O
log-on	O
by	O
local	O
area	O
network	B-Architecture
managers	O
for	O
the	O
purpose	O
of	O
management	O
,	O
</s>
<s>
Allows	O
users	O
to	O
access	O
information	O
from	O
another	O
host	B-Application
processor	B-General_Concept
for	O
transaction	O
processing	O
,	O
</s>
<s>
PuTTY	B-Operating_System
is	O
an	O
example	O
of	O
a	O
virtual	B-Application
terminal	I-Application
.	O
</s>
<s>
ITU-T	O
defines	O
a	O
virtual	B-Application
terminal	I-Application
protocol	O
based	O
on	O
the	O
OSI	O
application	B-Application
layer	I-Application
protocols	O
.	O
</s>
<s>
However	O
,	O
the	O
virtual	B-Application
terminal	I-Application
protocol	O
is	O
not	O
widely	O
used	O
on	O
the	O
Internet	O
.	O
</s>
