Command-Control-Arrow beeps (plays alert sound) in Lion I've noticed since upgrading to Lion that if I press Command-Control-Left/Right (and sometimes Down as well; see below), my computer beeps at me (plays alert sound).

It doesn't occur in all applications:


In Console, I can press any of the above key combinations, and there's no beep.
In Mail, it beeps if I press Command-Control-Left/Right, but not Up/Down.
In most every other application, every combination except Command-Control-Up causes a beep.


I can't seem to find any menu commands that it might be trying to invoke, although even if that were the case, applications such as NetBeans and PhpStorm are the proverbial monkey wrench here:  I have Command-Control-Left mapped to "go to last edit".  When I press that key combination, my Mac still beeps at me, but it it also does move the cursor to the last edit location.

What does Command-Control-Left/Right/Up/Down map to that my Mac is complaining about?
I've found a nice workaround.
Create the file ~/Library/KeyBindings/DefaultKeyBinding.dict with the following content:
&lt;=10.10 Yosemite (Found on GitHub/Atom)
{
    &quot;^@\UF701&quot; = &quot;noop:&quot;;
    &quot;^@\UF702&quot; = &quot;noop:&quot;;
    &quot;^@\UF703&quot; = &quot;noop:&quot;;
}

10.11 El Capitan through 10.15 Catalina (from Adobe/Brackets)
You'll need to create the ~/Library/KeyBindings directory first, and the @ and ^ characters are switched.
{
    &quot;@^\UF701&quot; = &quot;noop:&quot;;
    &quot;@^\UF702&quot; = &quot;noop:&quot;;
    &quot;@^\UF703&quot; = &quot;noop:&quot;;
}