Once you're using a subset, every shift-click on an Index View adds the neighborhood of a word to your working subset; every shift-option-click subtracts a word's neighborhood from the subset. What could be simpler?
If you want to change the definition of what a word's neighborhood is, just command-click on one of the Empty buttons at the top of the Browser window. The default proximity distance is 48 bytes, which corresponds to half a dozen or so words. To take in a broader range, try setting the proximity distance to 500 bytes (a few sentences) or 5000 bytes (a few paragraphs). Note that a changed proximity distance definition applies only to all subsequent subset shift-click operations; it does not change a previously-defined subset.
Once you've defined a subset by shift-clicking on an Index View, a click on a word takes you to the Context View ΓÇö but with a difference. This time, only those words that are members of your subset are shown on a line with contextual information around them. If you've defined a very sparsely-populated subset, there may be lines in the Context view of dots, ΓÇ£...........ΓÇ¥, showing places where 100 words were skipped without finding one that fell within your subset.
