Force-quit the HP Communications application. HP Comm Killer has one purpose, it force-quits the HP Communications application which, under versions of 10.2.x and 10.3.x, will \\hang\\ if the PSC (PSC1210 in my case) is turned off or unplugged and then connected/turned on again. Then, when attempting to scan anything, the HP Communications application will hang. Why do I need it? HP Communications is a \\faceless\\ application\; you can't force-quit it from the Finder. You need to dig out the Activity Monitor, find the HP Communications App in the list, click on it and \\force-quit\\ the app. Until HP fixes the problem, HP Comm Killer will force-quit the app for you. Place it in your Dock next to the HP Director icon so you can easily fix the problem when it occurs. How much does it cost? Nothing. Whoever responds from a location farthest from El Paso, Texas wins. I don't know what you win but you win. FAQ's: How do I use it? Double-click it or put it in your Dock and single-click it (preferred method). It will force-quit the HP Communications application and then quit. Why did HP Comm Killer launch but not quit? If HP Communications is not running, HP Comm Killer will not automatically quit. I didn't know the command to check if it was running so you'll have to quit manually (Command-Q). Maybe I'll fix this. Maybe HP will fix their stuff first so my app isn't necessary. HP Comm Killer was created with Revolution v2.2 for OS X.