2nd JFrame at Full Screen not registering key events

I've written an application that launches other applications distributed as JARs with a particular method (replacing the main method). These other applications run at full screen.
Whilst I have got these other applications to work in that they display correctly and do everything else, I require them to register key events. If I run these applications on their own (i.e. having not been launched by the primary application) then the key events are processed correctly. However when they are launched from the primary application the key events are not registered.
I have tried requesting focus from the full screen JFrame but it doesn't seem to be able to.
Any ideas?

Possible that the keystrokes are really being trapped by the other gui, which stops registering them when it's not visible.
IF that's the case, you'll need to re-design your keyboard trap as part of the second JFrame, wholly independent of the original JFrame or originating app. Also, it may be thread-starved i.e. operating off the originating program, which thread may be stopping when it has no focus.
That's all the ideas I have.

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