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The name of an application software installed in the Data Swallow OS, ver. 3.0.1 and later, one that can look up various vocabularies. Peek-A-Boom! is used in all sorts of situations, as an extremely convenient application that will search the Electrosphere with a selected keyword and display the relevant data with a color image. The original publisher is Glossary Study Limited, which has a special server for vocabulary search.