How do I not display some icons on the Dock?

I have a few apps which I'm always running, and they do more backgroundy tasks that I don't really need a dock icon for. It's just filling up my already over-crowded dock up with useless icons. Is it possible to hide the icons of some apps even when they're running?

Actually, there is a way to hide dock icons of running applications. It's not a simple checkbox-type option (unless the application itself provides the option), but it is doable.
You need to edit the "Info.plist" file of each application you want to hide. Lets say the application is Safari (which you obviously wouldn't want to hide). You would go to Safari in the Applications folder. Ctrl-click on it and choose "Show Package Contents." Go into the Contents folder, and there will be a file called "Info.plist" Ctrl-click on it, go to "Open with" and click on other and select TextEdit in your Applications folder. Anywhere in the document, paste the following onto their own lines:
[KEY]NSUIElement[/KEY]
[STRING]1[/STRING]
Save the document. Now the next time you open the Safari, it's Dock icon will be hidden. Since the Dock icon is gone, that means you can't select the app, so you can't get to it's menus to change options and it will not show up in the Force Quit dialog (but if you need to, you can force quit it in Activity Monitor), so you obviously wouldn't want to do this for Safari or any other programs you regularly interact with.
If you need to unhide the Dock icon later, just change the 1 to a 0. I would do this with the app closed, but if you can't then you'd probably just have to restart it. Also, you may have to do this again if the app is updated.
Hope this helped.

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