<s>
RealVNC	B-Language
is	O
a	O
company	O
that	O
provides	O
remote	B-Protocol
access	I-Protocol
software	I-Protocol
.	O
</s>
<s>
The	O
software	O
consists	O
of	O
a	O
server	O
(	O
VNC	B-Protocol
Server	I-Protocol
)	O
and	O
client	O
(	O
VNC	B-Protocol
Viewer	O
)	O
application	O
for	O
the	O
Virtual	B-Protocol
Network	I-Protocol
Computing	I-Protocol
(	O
VNC	B-Protocol
)	O
protocol	O
to	O
control	O
another	O
computer	O
's	O
screen	O
remotely	O
.	O
</s>
<s>
Andy	O
Harter	O
and	O
other	O
members	O
of	O
the	O
original	O
VNC	B-Protocol
team	O
at	O
AT&T	O
founded	O
RealVNC	B-Language
Limited	O
in	O
2002	O
.	O
</s>
<s>
The	O
automotive	O
division	O
of	O
RealVNC	B-Language
spun	O
out	O
as	O
a	O
separate	O
company	O
(	O
)	O
in	O
2018	O
.	O
</s>
<s>
For	O
a	O
desktop-to-desktop	O
connection	O
RealVNC	B-Language
runs	O
on	O
Windows	B-Application
,	O
macOS	B-Application
,	O
and	O
many	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
A	O
RealVNC	B-Language
client	O
also	O
runs	O
on	O
the	O
Java	B-Device
platform	I-Device
and	O
on	O
the	O
Apple	O
iPhone	B-Device
,	O
iPod	B-Device
touch	I-Device
and	O
iPad	B-Device
and	O
Google	B-Application
Android	I-Application
devices	O
.	O
</s>
<s>
A	O
Windows-only	O
client	O
,	O
VNC	B-Protocol
Viewer	O
Plus	O
was	O
launched	O
in	O
2010	O
,	O
designed	O
to	O
interface	O
to	O
the	O
embedded	O
server	O
on	O
Intel	B-Application
AMT	I-Application
chipsets	O
found	O
on	O
Intel	B-Architecture
vPro	I-Architecture
motherboards	O
.	O
</s>
<s>
RealVNC	B-Language
removed	O
VNC	B-Protocol
Viewer	O
Plus	O
from	O
sale	O
on	O
28th	O
February	O
2021	O
.	O
</s>
<s>
For	O
remote	B-Protocol
access	I-Protocol
to	O
view	O
one	O
computer	O
desktop	O
on	O
another	O
,	O
RealVNC	B-Language
requires	O
one	O
of	O
three	O
subscriptions	O
:	O
</s>
<s>
Users	O
must	O
activate	B-License
each	O
of	O
the	O
server	O
versions	O
(	O
"	O
Home	O
"	O
,	O
"	O
Professional	O
"	O
,	O
"	O
Enterprise	O
"	O
)	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
VNC	B-Protocol
5.0	O
late	O
December	O
2013	O
,	O
RealVNC	B-Language
software	O
editions	O
used	O
a	O
single	O
binary	O
which	O
superseded	O
VNC	B-Protocol
Enterprise	O
Edition	O
and	O
VNC	B-Protocol
Personal	O
Edition	O
.	O
</s>
<s>
In	O
November	O
2016	O
,	O
RealVNC	B-Language
released	O
the	O
updated	O
version	O
of	O
their	O
software	O
,	O
now	O
called	O
VNC	B-Protocol
Connect	O
(	O
version	O
6.0	O
)	O
.	O
</s>
<s>
RealVNC	B-Language
clients	O
using	O
vncviewer	O
can	O
run	O
in	O
full-screen	O
mode	O
;	O
they	O
use	O
the	O
F8	O
function-key	O
as	O
the	O
default	O
key	O
for	O
bringing	O
up	O
an	O
options	O
menu	O
(	O
which	O
includes	O
the	O
option	O
to	O
,	O
among	O
other	O
things	O
,	O
switch	O
off	O
full	O
screen	O
mode	O
or	O
to	O
forward	O
a	O
Control-Alt-Delete	O
key-sequence	O
)	O
.	O
</s>
<s>
The	O
server	O
component	O
of	O
RealVNC	B-Language
allows	O
a	O
computer	O
to	O
be	O
remotely	O
controlled	O
by	O
another	O
computer	O
.	O
</s>
<s>
RealVNC	B-Language
uses	O
the	O
RFB	B-Protocol
protocol	I-Protocol
.	O
</s>
<s>
RFB	O
6.0	O
defaults	O
to	O
TCP/UDP	O
port	B-Protocol
5900	I-Protocol
.	O
</s>
<s>
When	O
making	O
a	O
connection	O
over	O
the	O
Internet	O
,	O
the	O
user	O
must	O
open	O
this	O
port	O
in	O
the	O
local	O
firewall	O
as	O
well	O
as	O
configure	O
port	B-Protocol
forwarding	I-Protocol
to	O
forward	O
TCP	O
Port	B-Protocol
5900	I-Protocol
(	O
or	O
the	O
customized	O
port	O
respectively	O
)	O
to	O
the	O
local	O
machine	O
address	O
if	O
behind	O
a	O
NAT	B-Protocol
Router	O
.	O
</s>
<s>
As	O
an	O
alternative	O
,	O
one	O
can	O
tunnel	O
VNC	B-Protocol
through	O
SSH	B-Protocol
,	O
avoiding	O
the	O
opening	O
of	O
additional	O
ports	O
and	O
automatically	O
traversing	O
the	O
NAT	B-Protocol
router	O
.	O
</s>
<s>
SSH	B-Protocol
also	O
provides	O
encryption	O
of	O
the	O
connection	O
between	O
the	O
VNC	B-Protocol
server	I-Protocol
and	O
viewer	O
.	O
</s>
<s>
After	O
proposing	O
remote	B-Protocol
access	I-Protocol
interface	O
for	O
Weston	O
in	O
October	O
2013	O
,	O
RealVNC	B-Language
published	O
a	O
Wayland	B-Language
developer	O
preview	O
in	O
July	O
2014	O
.	O
</s>
<s>
The	O
VNC	B-Protocol
protocol	I-Protocol
is	O
pixel-based	O
.	O
</s>
<s>
Although	O
this	O
leads	O
to	O
great	O
flexibility	O
(	O
e.g.	O
,	O
any	O
type	O
of	O
desktop	O
can	O
be	O
displayed	O
)	O
,	O
it	O
is	O
often	O
less	O
efficient	O
than	O
solutions	O
that	O
have	O
a	O
better	O
understanding	O
of	O
the	O
underlying	O
graphic	O
layout	O
,	O
like	O
X11	B-Operating_System
.	O
</s>
