Not sure really. I don't have much experience with it. Its installed on my system, my AV says once a week its found a virus in it (which is actually a file in the Java cache). Thats about all know.
Im talking about something that would let you take ANY peice of software, and install it on ANY OS, without buying a different version, or running any patches, etc.
For example, you could buy a game, and install it on Windows. You could then take that disc, and install it on Linux and Mac too.