I ran the top command and the output said there were 3 users - there's only me and root - who's the third one?
Here's the output:
top - 18:23:30 up 19 min, 3 users,
ksysguard says I have these other users:
xfs, uuidd, root daemon (atd,) messagebus and haldaemon twice (acpi and hald)
I ran usb-imagewriter and it crashed, I almost always use ksysguard, but I thought I might get some clues by looking at top
Sorry for my ignorance, but I was afraid there was some 'secret' user on my machine.