Install and Use XTRlock

XTRlock is a application to lock your Desktop without swich user, it will be hold only in a user. Then to open it, you must type your password on keyboars. If your password is correct, it will be open with automatically.

If you wanna try, use this command on your Terminal :

$ sudo apt-get install xtrlock

To launch the XTRlock. Press Alt + F2, then type xtrlock.

Then your desktop will be auto lock like this :

XRDP : Easiest way to Remote Desktop on Linux

XRDP is a program for providing connections to an X display using Microsoft's Remote Desktop protocol/client. It is useful for getting a remote GUI to a Linux server from a Windows machine without having to install an X server on the Windows machine, or on a machine that can't run an X server but can use a Remote Desktop client, such as a Windows Mobile phone. (Source : en.gentoo-wiki.com/wiki/Xrdp)

(Source : http://i.mivi.fr)

I’ll be using Debian 6.0 (Squeeze)

Since xrdp requires a vnc server, one is automatically installed with xrdp, BUT the only working one is tightvnc (if you have already installed vnc4server, remove it) so you MUST install tightvnc first, either using synaptic or the following command:

$ sudo apt-get install tightvncserver

Remote Desktop Windows from Linux (Debian/Ubuntu) with RDesktop

Fortunately, Linux has rdesktop utility. It is a client for remote desktop protocol (RDP), used in a number of Microsoft products including Windows NT Terminal Server, Windows 2000 Server, Windows XP, Windows 2003 / 2008 Server, Windows Vista and Windows 7. You do not need to install VNC server. All you need is rdesktop client on Linux or BSD workstation.

Install rdesktop
Type the following command as root user :

# apt-get install rdesktop