Hello, my name is basem and i am experienced in socket programming, i have done a VOIP conference system before so i know exactly how to do your program.
I will simply create a windows form that listens to a specific port and receive information on it.
Say you sent 250,55 then the windows form will be moved to location 250,55 on the screen.
You can call it with java script of course and send the required information on the port.
Hope i got everything right.
Best Regards,
Basem.