1. Remote Computing e-mail Services Cloud connection Distributed system
Secure remote connectivity

2. Remote Computing Does not have any physical access.
Using computer network.
Tools:-
SSH (Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. The best known example application is for remote login to computer systems by users.)
Telnet (Telnet is an application layer protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection.)

3. Virtual Network Computing:-
In computing, Virtual Network Computing (VNC) is a graphical desktop sharing system that uses the Remote Frame Buffer protocol (RFB) to remotely control another computer. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network.
Remote PC:-
bVNC is an open source app with a paid version that you can purchase to thank the developer. However, you can normally use the free version to view and control the screen of your Linux system. The bVNC app is a VNC viewer, which means you'll have to install a VNC server on your computer.
Other example:- LogMeIn, TeamViewer, GoToMyPC, Remote Graphics Software etc.

4. Linux Remote Desktop Connection Instructions
We don't have to install anything to enable the remote desktop on Ubuntu. All we have to do is go to System > Preferences > Remote Desktop:

5. Allow other users to view your desktop
Allow other users to control your desktop
Ask for confirmation
Require the user to enter this password
Only allow local connections
Use an alternate port
Disable the wallpaper when connected
Require encryption
Lock screen on disconnect 
Always display icon
Only display an icon when there someone is connected
Never display an icon

6. Commands for remote computing
ssh [command or script]
ssh: ssh (SSH client) is a program for logging into a remote machine and for executing commands on a remote machine.
USER-NAME: Remote host user name.
REMOTE-HOST: Remote host ip-address or host name, such as fbsd.cyberciti.biz.
command or script: Command or shell script is executed on the remote host instead of a login shell
Examples
Get disk information from a server called www1.cyberciti.biz:
$ ssh df -h
(B) List what ports are open on remote host $ ssh netstat -vatn
(C) Reboot remote host: $ ssh reboot
(D) Restart mysql server (please note enclosed multiple command line arguments using a single or double quotes) $ ssh '/etc/init.d/mysql restart'
(E) Get memory information and store result/output to local file /tmp/memory.status: $ ssh 'free -m' > /tmp/memory.status
(G) You can also run multiple command or use the pipes, following command displays memory in format of “available memory = used + free memory” : $ ssh free -m | grep "Mem:" | awk '{ print "Total memory (used+free): " $3 " + " $4 " = " $2 }'

7. Commands for remote computing
# apt-get install screen (On Debian based Systems)
# yum install screen (On RedHat based Systems)
Just type screen at the command prompt. Then the screen will show with interface exactly as the command prompt.
~ $ screen
Show screen parameter
When you enter the screen, you can do all your work as you are in the normal CLI environment. But since the screen is an application, so it have command or parameters.
Type “Ctrl-A” and “?” without quotes. Then you will see all commands or parameters on screen.
To get out of the help screen, you can press “space-bar” button or “Enter“. (Please note that all shortcuts which use “Ctrl-A” is done without quotes).

8. Commands for local display
Detach the screen
~ $ screen
~ $ sudo apt-get install dpkg
Re-attach the screen
~ $ screen –r
~ $ screen –ls
~ $ screen -r 7849
Logging whatever you do
~ $ screen –L
Lock screen
press “Ctrl-A” and “x” shortcut to lock the screen
Add password to lock screen
~ $ mkpasswd pungki123
Leaving Screen
First, we are using “Ctrl-A” and “d” to detach the screen
also can use “Ctrl-A” and “K” to kill the screen

9. Thank You