BLINKER EXECUTABLE SERIAL
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  Purpose : Specify serial number to encrypt into the .EXE

  Syntax  : BLINKER EXECUTABLE SERIAL <serial number>

  Example : BLINKER EXECUTABLE SERIAL 001001 5 Blink, Inc.

  This command is used to encrypt a serial number and other information of
  up to 50 characters into the executable file which can then be examined
  by the program using the BLISERNUM() function at runtime.

  This information is encrypted into the executable file and can be used
  to hide a serial number and licensee name in the executable file as a
  form of copy protection.  Any information following the BLINKER
  EXECUTABLE SERIAL command on the same line of the script file is
  encrypted into the .EXE file up to a limit of 50 characters. An
  identical string is returned in the same format by the BLISERNUM()
  function at run time.

  The serial number in the above example can be examined by assigning the
  serial number to a string and then manipulating it using a substring
  function, for example:

  TMPSTRVAR = BLISERNUM()
  ? "Serial number :", SUBSTR(TMPSTRVAR,1,8)
  ? "Number of users :", VAL(SUBSTR(TMPSTRVAR,10,1))
  ? "Licensed to :", SUBSTR(TMPSTRVAR,12,20)