◄Directive Summary►  ◄Summary►
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  Syntax:  .ERRDEF name
           .ERRNDEF name
 
  .ERRDEF generates a severe error message if name is a previously
  defined symbol. .ERRNDEF generates a severe error message if name has
  not been defined.
 
  One of the most common uses of the .ERRNDEF directive is to ensure that
  a symbol has been defined before you attempt to use it. This situation
  may arise if the source code depends on the command line or Assembler
  Flags dialog box to define a symbol.
 
  See Also:  .ERR, .ERR1, .ERRB, .ERRDIF, .ERRE, .ERRNZ
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