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Our OS X Java application which is launched by a shell script inside the MyApp.app bundle gets a strange command line parameter -psn_0_989382 when launched from the Finder, but not when launched directly from the Terminal. Where can I find information what this command line parameter is good for?
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If your cursor is stuck and you can't work with Quit All, you can try accessing the Force Quit menu with the following keyboard shortcut: Command + Option + Escape. This will open a new dialog menu where you can choose Finder > Relaunch.
To change these preferences, click the Finder icon in the Dock, then choose Finder > Preferences.
The simplest way to disable an app from launching on startup is from the Dock. Right-click on the app and hover over Options in the menu. Apps that are set to open automatically will have a check mark next to Open at Login. Click that option to uncheck it and disable it from opening.
Note: You won't be able to quit Finder because macOS requires Finder to run continuously. You can also quit an application by pressing Command+Q on your keyboard.
Mac OS X assigns a unique process serial number ("PSN") to all apps launched via GUI. It's used for identifying various processes and instances of executables.
There's nothing I can really add to the documentation, so the best thing is to read the ProcessSerialNumber section of the Carbon Process Manager Reference (original Apple link is dead; this is a mirror).
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