Stop A Form from Closing

I want to stop a MDI form from closing unless certain criteria is set.  I also want to prevent a form from closing if Ctrl-F4 is pressed.  I know I can stop this two ways, either writing code on the onCloseQuery or setting the Crtl-F4 key press to zero.  My problem is, 1) after setting the criteria in the onCloseQuery - what is the code that actually STOPS the form from closing and 2) how do you set CTRL-F4 to zero?  I'm hoping writing code in the onCloseQuery stops a CTRL-F4 key press, but if it doesn't, I need answers to both questions.
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d4jaj1Asked:
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peter_vcCommented:
procedure TMDIChild.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  { if form not allowed to close then }

     Action := caNone;

  { else }

     Action := caFree;

end;

This should do the trick.

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d4jaj1Author Commented:
Great Job.  I've asked this question, what seems to be a vey simple question four times, each receiving a wrong answer.  Thanks for finally giving me an answer that works!
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