Is there a way to lock minimized windows?

Start a new instance of Safari and leave the one with the streaming music minimized.

Ra_ wrote:
Two instances in the same time.
And what if I want to lock two windows, I will not have three Safaris...

I don't know of any limit to the number of separate instances of Safari one can run.
When you minimize any one of them, they will be in the dock. They are all independent.

Ra_ wrote:
"way more"

I consider it a rather trivial solution. "way less"
Perhaps you will find a simpler one.

You don't need a new instance of Safari, just a new window.

Have you considered using spaces?

Its not the solution you are looking for, but you can just put the windows you don't want to see on another desktop. That way you don't even have to minimize them.

Enable spaces in system prefs> Expose & Spaces > spaces Tab.

You may want to experiment with key combos for switching between spaces, and you may want to try unchecking "When switching to an application, switch to a space with open windos for the application"

Have you tried tabs?

you know what, now that I think about it, there is actually a simple solution.

just install firefox (or opera or some other browser). use it for your streaming, and safari for everything else. you can leave firefox minimized, or even right click the icon in the dock and "hide" it.

when you switch back to safari from whatever your doing, firefox will continue to do its thing uninterrupted. and this would work with as many windows/tabs of firefox as you want to keep running in "locked" mode.

if you browse to a page in safari that you want to "lock away" just copy the url into a new firefox window/tab and minimize(or hide) again.

Ra_

As you may have guessed or gotten from the other posts here, is that you can not Lock a minimized window to the Dock. However as others have tried, you can always try a work around. Which leads me to mine.

You can always clip the Internet media player into Dashboard. Easy Way to do so is select File -> Open in Dashboard -> And then select the Frame around your media player -> and click Add. It will open up in Dashboard, However your not done yet, there will be a little ( i ) in the bottom corner of this web clip widget, click it and there you will see options for themes but more importantly an option to play audio in dashboard only. Please make sure that is unchecked. And there you go, a way to have your page loaded, and out of sight and mind.

Hope that helps,
Weston