Why do I have more users than I should on uptime

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http://askubuntu.com – on running the uptime command, it tells me that I have 5 users logged in. I don't understand this since I have on one user registered on this computer. This is the output 11:07:19 up 5 days, 1:11, 5 users, load average: 0.42, 0.67, 0.56 (HowTos)