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IsEmpty I have seen many people, even expert FileMaker developers, check for an empty field by comparing it to to double quotes (""). While this method may work some of the time, it can fail in some situations. Always use the IsEmpty function.
Dull Boy FileMaker files were stored in clear text prior to FileMaker 7 so, if you opened a FileMaker file in a text editor, you could see the phrase "All work and no play makes Jack a dull boy" in the header repeated over and over. No, it's not a virus! My understanding is the developers just needed to take up some space in the header and that's what they came up with. Today, modern FileMaker files are stored in Unicode so I'm not sure if the phrase is still there.