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From: Brian Drummond <brian3@shapes.demon.co.uk>
Subject: Re: confusion about message passing between the tasks
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On Sat, 25 Oct 2014 17:41:37 -0700, compguy45 wrote:

> how do i modify it so it works?

If you want to use the input value of an argument, declare as mode in. 
If you want to pass a value out via an argument, declare as mode out. 
If you want to do both, declare the argument as mode in out. 

- Brian