wandering aimlessly without ties to a place or community; vagabond
led a vagabond life
a rootless wanderer
Microsoft Computer Dictionary
n. A mode in which an application belonging to a different user interface can run on top of a computer’s underlying operating system without affecting that desktop or applications it may be running. For example, programs belonging to a rootless version of the X Window System can be run on a Mac OS X computer without disturbing the Aqua desktop. See also Mac OS X, X Window System.
