Vista - Switching users and started processes

We have guests visiting us and rather than have them use 'my' computer, I
easily created a Guest account.

I was pleasantly surprised when I started a backup (to a remote site) on my
side of the computer and then choose the Switch User screen. When I went
back many minutes later to my side of the compuetr, the backup was
completed. Did this also exist in older versions of Windows. I find this a
great idea. Just passing this on.