BLIERRPRM / BLIERRPRMBAS
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  Function : Get Blinker error parameter

  Syntax   : cValue = BLIERRPRM()

  Return   : String containing name of file related to the Blinker error

  Some of the Blinker runtime errors refer to a particular file name, and
  this function returns this file name for use in the error message.

  For details of modifying the Blinker error handler see Chapter 4,
  Special Features.

  For details of the Blinker runtime errors see chapter 8 Runtime Error
  Messages.

  Example  :
  *  Get the Blinker error parameter
  *
  ? "The file causing the BLINKER error is ", BLIERRPRM()