Joe,

Some mussings that may help your learning path.

Just to keep it clear {{Tiddler}}
Means transclude Tiddler, by default the text field. You could transclude the 
content of fieldname as well eg {{Tiddler!!fieldname}}

Whilst calling this transclusion we often refer to as "text reference" because 
it references other text "in line". Commonly used for storing a tiddller 
containing a state of something, it also allows you include one or a set of 
predifined actions into the actions parameter, and thus can work as reusable 
code/actions.

When you transclude something in something else it clearly gets replaced before 
the widget or wiki text is interpreted, and usualy itself interpreted before 
hand. So if you transcluded a tiddler containing a list widget in wikitext it 
would tranlate into a list as wikitext is want to, but not in a parameter, 
allowing the widget to act on the parameter.

You can also include actions inside 
<$button parms>
Zero or more Action widgets as in your example
Button text or image
</$button>

But the above model with action widgets inside buttons supposed to be avoided, 
which I do not like as it can sometimes make it harder to read your own code 
since actions parameter points to somewhere else.

Enjoy
Tony

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