> For the complete documentation index, see [llms.txt](https://community-test.logicnets.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://community-test.logicnets.com/release-9/platform-documentation/advanced-topics/external-document-storage/ess-basics/selecting-an-application.md).

# Selecting an Application

The first time the LogicNets system opens a document (typically a new document) it must determine the appropriate LogicNets application associated with that document. When a document is saved the system stores the application details in the document meta section, so LogicNets can start the same applications in future.

Optionally, the ESS can provide the package name or package category of the LogicNets application the system should open, and most versions of a protocol have a different name but the same category. The LogicNets system uses this information if it is available. Otherwise, the LogicNets system queries all installed LogicNets applications and runs the corresponding trigger logicnets (logicnets that are located in the *triggers* folder in the project located in the Designer). The LogicNets system provides the document meta data to these trigger logicnets, and the trigger logicnets "decide" if the application is applicable. The LogicNets system displays a list of applicable applications to the user, and starts the application the user selects.

![](https://2802811211-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FdFhfexCjZ5JMhwGzzywq%2Fuploads%2Fgit-blob-78d90cd878717e8fd0fbd42a1fb78468fa5eddcc%2Feccd59b0-bcea-43aa-93e2-4bf0cc38d4fe.png?alt=media)


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