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    pError()

          Indicates if the queue of Print is stopped by any mistake

    Syntax:

         pError() -> lError

    Description:

         Indicates if Print has detected any error or problem and has
         stopped the impresion queue.
         Check that Print is installed before using this function.

    Return:

         .T. if there is error or .F. if there is not error.

    Example:

         If ! pError()
           Warning ( "Ok" )
         EndIf