Using remotedesktop viewer you can control a desktop or workstation remotely by following steps.

First you need to enable the remote desktop

goto System –> preferences –> click on the remote Desktop.

after clicking on that a window will pop-ups like below

or you can enable the remote desktop using terminal by below commands

to enable

smartproteam@smartproteam:~$ gconftool-2 -s -t bool /desktop/gnome/remote_access/enabled true

to disable

smartproteam@smartproteam:~$ gconftool-2 -s -t bool /desktop/gnome/remote_access/enabled false

Now check the options   “Allow other users to view your desktop” and “Allow other users to control your desktop” .after checking that box close the windows.

now you can use remote desktop viewer by goto Applications –> Internet –> click onthe option “Remote desktop viewer”

a window will pop-up again like below

On that circled box you need to enter the hostname or ip of the remote Desktop.after enter click connect  you  will get the remote desktop of the remote machine.