I want to implement something basic:
N users on N different computers to see a canvas with N dots.
Each user controls a single dot with his arrow keys.
Each user can see all other users' (and his own) dots moving around.
Once a user connects, a corresponding dot appears.
Once a user disconnects, the corresponding dot disappears.
Can you please suggest software to achieve this?
I would like to implement myself as much as possible, following an existing example. Language / technology is not a constraint.