Handling third party system-wide shortcuts

[LJWatson]

This might be an edge case, but possibly something to consider...

On Windows (and possibly other platforms) there are third party applications that set system-wide keyboard shortcuts. An example being the (small) collection of GUI-less Twitter clients used by screen reader users on Windows.

[chaals]

Is there a mechanism in those platforms to discover system-wide shortcuts?

Browsers should avoid collisions with those if they can...