A Universal Portal Search
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You're not always in the correct file, within a list view that allows for easy searching. Even beyond that, not all users of FileMaker Pro are familiar with creating multiple request searches.
The easiest solution in this situation is to provide Universal Portal Searching. It's like Google for your portals. The user enters search criteria into one field and results are provided based on searching many fields. Use this video article to learn a powerful technique for searching portals.