I’m hoping there’s a setting or script that can help me keep my running game (in windows) on top of all other windows. It has to run in windowed mode because it’s part of a suite of other things going on, but it must stay focused or active or whatever. I don’t mind if I have to tell it to come to front once per second or so.
I am not sure, if what you need is the Unity player to keep runing, even when you select other windows, or its the visual part that is most important?
But, the default for the webplayer (as an example) is that its not running in background, when clicking away from the browser window.
This can be enabled in the Project settings in Unity or by script:
http://unity3d.com/support/documentation/ScriptReference/Application-runInBackground.html
Application.runInBackground = true;
But I am not sure if this was your real question?