android_sylph 0 Newbie Poster
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What do you mean? The term "flag" can have many meanings, so your question is just too general to answer without writing a thesis on the term... :-(
What sort of project are you working on? There are several different concepts/objects you can apply the term "flag" to.
In general, a "flag" is used to either indicate some state or trigger or prevent certain actions...
You'll have to be more specific about your situation...
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