running only one instance of VLC

[Gandalf]

Hello,
i'm running ubuntu linux, and i have a problem i couldn't solve neither myself neither by searching, so my question is: how can i run only one instance of VLC i mean when i double click a file, instead of opening a new VLC instance, play it in the old one that is already playing or just stopped

thanks in advance

[dionoea]

an option is available in the prefs to run only one instance (don't remember where ... but you'll find it if you look)

[Gandalf]

well exactly but i don't find it!