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  Name:     extmem() - get amount of extended memory available
  Usage:    <integer> = extmem()
  Params:   none
  Returns:  integer equal to the amount of extended memory
            available in kilobytes

 ---------------------------------- Example ---------------------------------

                 * if machine has 1 meg of extended memory
                 ? extmem()
                 * prints 1024

                 * if machine has 512k of extended memory
                 ? extmem()
                 * prints 512

  Note:     Extended memory that is in use by print spoolers
            or ram disks is not considered available