xscreensaver is run automatically, in the background, when you log in. It will lock the screen if you are idle for a certain amount of time (thinking you have walked away and forgotten to log out).
To see all possible screensaver modes and options:
To lock the screen:
There should also be a LOCK icon at the bottom of the screen. Clicking that icon will run the --lock option.
Note: many of the screensaver modes have been disabled, as they are cpu-intensive. Please be careful if you turn on additional screensaver modes.
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