Okay, Software Update has a command-line equivalent at /usr/sbin/SoftwareUpdate. So theoretically, one could turn on Remote Login for a bunch of machines (with a firewall set up so that it would only accept connections at that port from one particular IP address) and have a master machine connect to each one of the Macs via SSH and execute that command with sudo, so the admin wouldn't have to walk from Mac to Mac starting Software Update. The thing is, if QuickTime happens to be in the list of updates, it always throws up this stupid "Enter QT Pro Key" dialog and stops the installation until someone clicks "Continue". Now, I realize that AppleScript GUI Scripting can be used to automatically click buttons, but it doesn't seem to work for the QT6Installer process because it, a GUI app, is run as root.
Is there any way to suppress the "QT Pro Key" window when doing a Software Update?