Disable some combination of keys

Hi!
1. I need to know how can i disable some combination of keys using java
example tab + space
2 .Also i want to quit Taskmanager automacally and i don't want my application to appear on screen

M y purpose is to disable alt+space, alt + F4, right clicking, any other combination of hot keys except alt+ctrl +del and preventing my application to appear on the taskbar not taskmanager.                                                                                                                                                                                                                                                                                                                                                                                           

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    Thank Frank and John,
    I tried to follow the instruction that you give me but result still be the same.
    I think the problem is not involve with javaScript because I can detect CTRL at the first time but the problem will occur in 2 cases.
    1 . It will occurs when user press ctrl button for the second time after we close alert box .
    2. when the page still shows alert message and user tried to press ctrl button ( ctrl+n and it worked)
    So, I think Firefox have some background process that monitor user input or have some thing .
    Regards,
    zenoni

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    you did not push the clips all the way in to secure the ribbon cable for the keyboard. the clips push a little further than you think if you do it right you can tug on the cable and can't pull it out.

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    =====================================================
    Fading out. " ... J. Arthur Rank on gong."
    Attachments:
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