Hang the computer.
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 Syntax

        GT_Hang([<lAllowCtrlAltDel>]) --> <ThisNeverReturns!>

 Arguments:

      <lAllowCtrlAltDel> is an optional logical value. If true (.T.)
      the user will be able to use Ctrl-Alt-Del to reset the machine,
      if false (.F.) the user will have to turn the machine off.
      The deafult value is .F.

 Returns:

      This function should never return!

 Description:

      Err.... I'm sure that one of you will find a use for this! <g>

 Examples:

      // Get the user to log into the system, if the login is invalid
      // hang the machine.

      if SysLogin()
         RunSystem()
      else
         GT_Hang()
      endif

 Source: HANG.C

 Author:  Dave Pearson