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When creating a new variable, modifying a variable that has not been saved, or importing a variable, you have the option of checking the Save to Dictionary box. Variables that are not saved to the dictionary will only be available in the current session (including when that session is re-opened or retrieved from a matrix). Variables that are saved to the dictionary will be available in future sessions which use the same database.
Check Save to Dictionary if you are creating a variable that you intend to use frequently.
