'''sneaky message passing''' is about finding out-of-band channels for passing
data between components.



** [errorInfo] **

[PYK] 2014-04-14: I added an object system to [Functional imaging] which uses
`$errorInfo` to bind methods to their instances.  Perhaps this is a hideous
thing to do, but in its first application, at least, it seems harmless enough. 



** procedure rewriting **

[Braintwisters] and other pages illustrate the art of rewriting procedures as
an alternate way of passing information into the procedure.




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