[nilkn]

I guess at the very least it'd be recognized as a separate window/app by the OS window manager, which might be convenient if you like to keep it open all the time and alt-tab to/from it.

However, at least on OS X, you can just use something like Fluid if that's all you want (http://fluidapp.com/).

[tasnent]

Exactly what I needed. Thank you very much.