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By default Mac OS X automatically checks weekly for software updates, as long as you have an internet connection. It is important to change this to daily so that your computer always has the latest updates. When your computer finds updates, it will prompt you to install them. You should always do so immediately.
When installing an update you will need to enter your password for the computer. Note that this might not be the same as your UNet password. If you do not remember your password or it doesn't work, contact the Help Desk.
After the update is complete, restart the computer if your computer tells you to.
Follow these directions to ensure that your Mac will automatically keep itself up to date.
Open System Preferences from the Apple menu (the apple logo in the top left of the screen).

Click on Software Update from the System section.

Click on the Update Software button. Make sure that the boxes next to "Check for updates" and "Download important updates in the background" are checked and the drop-down menu next to "Check for updates" says Daily. Click on Check Now and then if updates are available, click on Install # Items.

In the future, when Software Update opens automatically asking you to install important updates, install them as soon as possible by clicking Install # Items.