I am using a Linux machine with a KVM switch at work, and I commonly use emacs while switching between that machine and my other machine. I typically use the keyboard shortcut to swap between machines on the KVM, which is the key sequence: Scroll Lock, Scroll Lock, Up or Down. If I have an emacs window on top on Linux and hit these buttons, it will trap the Scroll Lock key presses and trigger a system beep from the CPU speaker. The KVM still switches, but on occasion, after the switch, it will register Scroll Lock as being stuck pressed, and so I'll be treated to an earful of system beeping. I have to switch back to the computer to get it to stop.
Is there something I can put in the .emacs file that will prevent the program from beeping when I hit Scroll Lock with the window on top?