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The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer.
 
The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer.
 
The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.
 
The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.
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=== The Memento application structure ===
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You generally don't have to concern yourself about Memento's structure. It takes care of everything for you. However, it is important that you know where in the wiki, in Help, or in online or other computer literature to read about the various layers & parts of Memento. So. we'll start with the bottom line, the ''simplified summary'', because if you choose to read about this, we'll have you in ''tiers'' (ha) &mdash; as in the ''tiers'' of a ''3-tier application architecture''. Seriously, the subject is large, but it nevertheless boils down to what's in the following paragraph.
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;Simplified summary: The Memento application has a 3-''layer'' structure (effectively the same as a 3-''tier'' architecture, which matters because it is how you'll read about it in literature on the subject) that almost entirely runs on your device. In the Memento wiki, we call them...
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*The ''user interface'' layer, which is what you see on the screen & interact with using your fingers or a keyboard & mouse
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*The ''scripting'' layer, running on your device and providing the programming logic to handle the data as you want
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*The ''database'' layer, running mostly on your device & handled without bothering you when your data in the cloud needs to be accessed
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To read further about Memento's structure read [[About:MementoStructure|here]].

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