Opacity, What Is The Name Of The Window?

[WartHog]

I run Ubuntu 7.10.
I use VLC to display my on screen video.
I want to add transparency to that window.
So I go to the 'Opacity Settings' tab, click add.
Now, what do I add here?
I've tried vlc, xvideo, VLC (Xvideo output), xvideo output.
None of these worked.

Hekp please.

[KJ44]

Use "xprop" - see here:

http://forum.compiz-fusion.org/showthread.php?t=1768

[WartHog]

Thank you .. problem solved.

I sure learned/am learning a lot from that link.
Much appreciated.