Mohammad, the explanation by BurningTreeC is the really the key to 
understanding the issue here.

the *all* operator creates an output, ignores every input. the *is* 
> operator filters an input
>

I guess the first : <$list filter="01 02 03"> :  is just setting the 
<<currentTiddler>> variable. The *all* operator can use that, the *is* 
operator ignores it?

I believe this difference between "creating an output" and "filtering an 
input" deserves to be clarified the documentation, and I may do that.

Also, Mark said:

The "is" operator has the advantage that it can take a "system" parameter, 
> which is for some reason is missing from "all".
>

As a general question, would it not be a good idea to include a fundamental 
category of *system* in the *all* operator?

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