Launch application in gnome session of another user.

Linux and Unix-Like Linux
1

A gnome session is launched by UserA of System A, I am connected to userB of System B(or A) through PUTTY. I want to launch an application for eg: gedit through Putty in the display of system A. how can I achieve this.
for eg:-
root is logged in to System A, with gdm.
DISPLAY=0.0, ip = aa.aa.aa.aa

User Sivam is logged into putty console.
He has to launch gnome-terminal in root's session using putty..

what are the configurations steps to be taken.

2

Did you try to use different DISPLAY? Set different display on second console and try like DISPLAY=0:1

3

Try doing:

su - USER_A -c "xauth add `xauth list :0.0`; DISPLAY=:0.0 program-you-wish-to-launch"

4

how about using ssh with another machine ( user on another machine ) and launching an application from that.

5

If X is running on the machine where you ssh to:

DISPLAY=:0.0 XAUTHORITY=/home/user_running_X_on_the_display/.Xauthority your-program