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The QDStartup ($0204) call has been modified to signal an error and terminate any process that tries to make the call when it's controlling terminal is not the Apple IIgs console. This prevents a user on a remote terminal from bringing up a desktop application on the console, an operation he could not escape from and one that would greatly annoy the user at the console.

Another change ensures that an attempt to execute two graphics-based applications concurrently will fail; the second process that tries to call QDStartUp is killed and a diagnostic message is displayed on the screen.