Should memorize PID of VLC

[pquerner]

If you want to see two livestreams at one and so have the application open twice, sometimes it will close the wrong VLC player, or does nothing at all. So: it should memorize the PID of the VLC which has been opened by the current task and not touch anything else. (eg. what happens if you force kill the vlc but have some other VLC running even before DLS did something ?)