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# Query with Binary Categories

After you train the binary category, you can use the `BinaryCatQuery` action to determine whether a piece of text, a file on disk, or a document in IDOL results in a “yes” (POSITIVE) or a “no” (NEGATIVE) answer for the question that the binary category asks. For example, your binary category might ask the question “Is this spam?” and could filter emails to ignore spam emails. For details on the `BinaryCatQuery` action, refer to the IDOL Server Reference.

For example:

    http://12.3.4.56:9020/action=BinaryCatQuery&Name=spam_binarycat&QueryText=How to become an instant millionaire

This action uses port `9020` to instruct the IDOL Category component, which is located on a machine with the IP address `12.3.4.56`, to check whether the text `How to become an instant millionaire` results in a “POSITIVE” or a “NEGATIVE” result for the question posed by the binary category `spam_binarycat`.

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