Windows 7: Internet Explorer 9 installer command line switches

The Internet Explorer 9 installer has a handful of command line switches that can be used. It’s not obvious that you could pass /help to get this list, so here’s a copy.
/help Displays this document.
/passive Run the installation without any input from the user.
/quiet Identical to /passive
/update-no Do not check for Internet Explorer updates.
/ieak-full:<path> Reserved for Internet Explorer Administration Kit use.
/ieak-branding:<path> Reserved for Internet Explorer Administration Kit use.
/closeprograms Close programs automatically to allow installation without rebooting the system.
/norestart Do not restart after installation has completed.
/forcerestart If a restart is required after installation, restart automatically.
/log:<path> Create a log file at :<path>.
/x:<path> Extract the installation package contents at :<path>.