Terminates the program with an optional dialog System unit
 procedure Halt ( { ExitValue : Integer } ) ;
The Halt procedure forces an abrupt termination of the current application.
Warning : resources cannot be guaranteed to be freed when calling halt.
Optionally, the ExitCode variable may be set by passing an ExitValue. This code is returned to the application invoker as the return code from the application.
If ErrorAddr has been assigned a value, when Halt is called, a dialog is displayed showing the ErrorAddr and ExitCode values.
After Halt executes, the finalization section of the unit is executed before the program actually terminates.
Warning : use only in exceptional circumstances.
Related commands
Break Forces a jump out of a single loop
Continue Forces a jump to the next iteration of a loop
Exit Exit abruptly from a function or procedure
ExitCode Sets the return code when an application terminates
Goto Forces a jump to a label, regardless of nesting
RunError Terminates the program with an error dialog
Abort Aborts the current processing with a silent exception
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Example code : Halt a program with an error dialog
  i : Integer;
  // Set up an error address so that halt shows a termination dialog
  ErrorAddr := Addr(i);

  // Stop the program with exit code 4

  // The following will not be executed
  ShowMessage('We do not get this far');
Show full unit code
   The program terminates without running the ShowMessage statement. An error dialog is displayed:
   Runtime error    4 at 0069FC94
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