<s>
xrdp	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
implementation	O
of	O
Microsoft	O
RDP	B-Protocol
(	O
Remote	B-Protocol
Desktop	I-Protocol
Protocol	I-Protocol
)	O
server	B-Application
that	O
enables	O
operating	B-General_Concept
systems	I-General_Concept
other	O
than	O
Microsoft	B-Application
Windows	I-Application
(	O
such	O
as	O
Linux	B-Application
and	O
BSD-style	O
operating	B-General_Concept
systems	I-General_Concept
)	O
to	O
provide	O
a	O
fully	O
functional	O
RDP-compatible	O
remote	B-Protocol
desktop	I-Protocol
experience	O
.	O
</s>
<s>
It	O
works	O
by	O
bridging	O
graphics	O
from	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
to	O
the	O
client	O
and	O
relaying	O
controls	O
from	O
the	O
client	O
back	O
to	O
X	B-Operating_System
Window	I-Operating_System
Server	B-Application
.	O
</s>
<s>
According	O
to	O
the	O
developers	O
,	O
the	O
protocol	O
works	O
with	O
rdesktop	B-Protocol
,	O
FreeRDP	O
and	O
Microsoft	O
's	O
own	O
Remote	B-Protocol
Desktop	I-Protocol
Client	O
.	O
</s>
<s>
In	O
order	O
to	O
relay	O
the	O
graphics	O
and	O
controls	O
between	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
and	O
the	O
user	O
,	O
XRDP	B-Application
can	O
utilize	O
several	O
forwarding	O
modes	O
:	O
</s>
<s>
Xvnc	O
:	O
This	O
mode	O
works	O
by	O
using	O
a	O
VNC	B-Protocol
server	I-Protocol
installation	O
.	O
</s>
<s>
xorgxrdp	O
/	O
X11rdp	O
:	O
In	O
this	O
mode	O
,	O
XRDP	B-Application
can	O
communicate	O
directly	O
with	O
the	O
X	B-Operating_System
server	B-Application
in	O
order	O
to	O
bridge	O
the	O
graphics	O
.	O
</s>
<s>
The	O
project	O
was	O
started	O
in	O
mid-2004	O
by	O
Jay	O
Sorg	O
based	O
on	O
the	O
work	O
of	O
rdesktop	B-Protocol
and	O
FreeRDP	O
that	O
had	O
previously	O
explored	O
implementations	O
of	O
the	O
proprietary	B-Application
Remote	B-Protocol
Desktop	I-Protocol
Protocol	I-Protocol
,	O
including	O
RemoteFX	O
.	O
</s>
<s>
The	O
initial	O
versions	O
of	O
the	O
XRDP	B-Application
project	O
relied	O
on	O
a	O
local	O
VNC	B-Protocol
server	I-Protocol
installation	O
that	O
had	O
to	O
be	O
present	O
alongside	O
the	O
program	O
,	O
in	O
order	O
to	O
relay	O
the	O
graphics	O
and	O
controls	O
between	O
the	O
user	O
and	O
the	O
server	B-Application
(	O
known	O
as	O
the	O
"	O
VNC	B-Protocol
forwarding	O
mode	O
"	O
)	O
.	O
</s>
<s>
Due	O
to	O
the	O
slow	O
performance	O
of	O
forwarding	O
to	O
a	O
VNC	B-Protocol
server	I-Protocol
,	O
the	O
developers	O
introduced	O
the	O
X11rdp	O
mode	O
–	O
which	O
allowed	O
for	O
direct	O
communication	O
with	O
the	O
X	B-Operating_System
Window	I-Operating_System
Server	B-Application
,	O
resulting	O
in	O
improved	O
draw	O
times	O
and	O
an	O
overall	O
better	O
user	O
experience	O
.	O
</s>
<s>
In	O
2019	O
,	O
the	O
XRDP	B-Application
developers	O
announced	O
the	O
project	O
as	O
the	O
replacement	O
to	O
the	O
X11rdp	O
mode	O
,	O
which	O
is	O
the	O
default	O
mode	O
that	O
XRDP	B-Application
uses	O
in	O
new	O
installations	O
.	O
</s>
