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If you’ve viewed
the tutorial, the search should look a little familiar. The number of records retrieved is probably
a bit lower – some time has passed since I did the example search for the
PowerPoint slides. In this slide, I
searched for the word “fear” after completing the search for the word
“mathematics.” Note that DIALOG has
assigned a set number for each set of records. I’m able to use these set numbers (“S1” and
“S2”) to find records where both words show up (again, simply in the basic
index). A third set, “S3,” is created
and the system responds with another prompt.
The word “AND” that I put between “S1” and “S2” is significant. The DIALOG system recognizes that as a
special word known as a Boolean operator …
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