 This is achieved through the use of a filter driver and layering technology Altiris acquired from FSLogic.By placing applications and data into managed layers called Virtual Software Packages (VSP's), SWV allows on-the-fly activation, deactivation, or resetting of applications, to avoid conflicts between applications, and to remove them cleanly without altering the base Windows installation.Altiris was acquired by Symantec Corporation in 2007, who are the makers of Norton AntiVirus, amongst other things.