NoMachine installation to connect Ubuntu 12.04

It is FREE, but looks like limited for 2 user to be able to connect, link:
...A complete solution for remote access to your Linux or Solaris workstation. It allows 2 users to connect at the same time no matter what their location is, and share the desktop.
NX Small Business Server - allow up to 10 sessions.

Install ssh server (without this you will failed to connect to 22 port):
sudo apt-get install ssh

Install node and server packages:
http://www.nomachine.com/download-package.php?Prod_Id=3776

Adjust server to work with Unity:
http://primozverdnik.com/2012/05/nomachine-nx-desktop-on-ubuntu-12-04-precise-pangolin-no-menus/

restart NX server:
sudo /usr/NX/bin/nxserver --restart

Install on Windows client version of nx-clinet:
http://www.nomachine.com/download-client-windows.php

Select Desktop = "Unix / Gnome" to connect to Ubuntu.
Login - is user name from target PC


Attention: to access you existing session (like in VNC), select Select Desktop = "Shadow" and during login you will get list of sessions to join, select first session where Session name = "Local display" and Dispaly="0". Row with Dispaly="1001" will open new session.

RDP connection from Windows to Ubuntu 12.04

manual: http://www.ubuntututorials.com/remote-desktop-ubuntu-12-04-windows-7/

That connection create only new connections to PC, no way to connect to existing session.

unfortunately did not worked for me as screen after login is empty.
Here is advise how to fix that problem, see two last comments of "arrghushakaboorga".

It works, but ! if you try to launch FireFox or Chrom from that session, Firefox will fail to launch if it existing in different session, Chrome launched in new session and disappeared (it appear in my real session at laptop).

So that behavior is not appropriate, failed to fix, fed up ... .