How do I block the Windows keys?

[William de Smet]

Hi there,

I am looking for a way to block the Window keys (65388 and 65389) but  
is doesn't work because I don't know how:
on rawKeyDown theKeyNumber
    if theKeyNumber is 65388 then .....????
    if theKeyNumber is 65389 then .....????
end rawKeyDown

And is there a way to use both CTRL and COMMAND key at the same time?  
When these keys are down I want to show an image and when these keys  
are up again the image is hidden.

Thanks!

Greetings,

William