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Message: <blockquote data-quote="chscag" data-source="post: 1317481" data-attributes="member: 46727">What you need is something to keep your users out of System Preferences after setting up a "native resolution" for the projector.  Open System Preferences on the iMac, go to "Security & Privacy".  Click on the "General" tab.  Click on the small lock at the bottom, enter your admin password to open the lock.  Under the label "For all accounts on this computer" place a check in the box that states:  "Require an administrator password....."Make sure you use a strong admin password with a mix of alpha, numeric, and odd characters.  That should keep your students from making changes to the resolution.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?