Review of Concepts To review a few of the concepts you've covered here:
A Lookup is like a Map where the keys are
es and the values are instances of those es. It's also useful to think of a Lookup as a place that objects swim 
o and out of, and you can subscribe to be not
ied of the arrival and departure of specic types of object. Utilities.actionsGlobalContext
is a Lookup which proxies the Lookup of whichever TopComponent currently has keyboard focus, and fires changes when focus moves to a dferent component. Nodes are presentation objects that can be displayed in a tree, list or other component from the Explorer API. Each Node has its own Lookup.
Just as Utilities.actionsGlobalContext proxies the Lookup of TopComponents (so you can just ask that lookup for a result and listen for changes in it, rather than having to track focus changes yourself), so also the Lookup created by ExplorerUtils.createLookup(ExplorerManager, ActionMap) will create a Lookup which automatically proxies the Lookup of whatever Node(s) are selected in an Explorer component.
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