BLINKER DEMONSTRATION MINUTES
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  Purpose : Specify number of minutes for demonstration version

  Syntax  : BLINKER DEMONSTRATION MINUTES <nuLimit>

  Example : # Set the limit on length of program execution

            BLINKER DEMONSTRATION MINUTES 20

  This command is used to set the number of minutes of program runtime
  before it will end with the 'demonstration minutes limit exceeded'
  message. It may be set to any number from 1 minute to 65535 minutes.

  This can be used to create a demonstration version of the program
  without having to modify the source code.  When the specified time limit
  is reached, the error handling procedure BLERRPRG is called with error
  number 1209, indicating that the demonstration minutes limit has been
  exceeded.

  The source for this error handler is provided should you want to modify
  the text of the termination message.

  Note: the demonstration restrictions are only checked when overlays are
  loaded, so to use them please ensure that at least one function or
  procedure which is called regularly is overlaid.

  The function BLIDEMMIN() allows the limit to be extended from within the
  program. Please see the appropriate section in Chapter 7 for more
  details.