> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/ltt/documentation/ltt-gui-manual/teststand/folderstructurets.md).

# Folder Structure

The **LTT TS directory** is the root of the LTT test execution system. At top level it contains the actual TestStand sequence file implementing your specific LTT testplan (and/or the template sequence file). It also contains the following sub folders:

![TS Folders](/files/Xxh6JK3D9Dn2WsjGqT8T)

| Folder   | Content                                                                                                                                                                                                                                                                                                                                   |
| -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| config   | Contains the TestStand configuration like StationGlobals, search paths, type definitions and so on. During installation of the LTT software the TestStand configuration directory will be set to this location. The default TestStand configuration directory is at `C:\ProgramData\National Instruments\TestStand\` and stays untouched. |
| examples | Contains MesSy examples sequences for both MesSy V1 and V2. You can copy those sequences into your own testplan as needed.                                                                                                                                                                                                                |
| lib      | Contains code modules (LabView, .NET) needed to operate the LTT. Specifically you will find there:ddd                                                                                                                                                                                                                                     |
| model    | Contains the [LTT process model](/ltt/documentation/ltt-gui-manual/teststand/processmodel.md)                                                                                                                                                                                                                                             |

## The lib folder

The lib folder contains some standard sub folder and files, which will be explained here. But it is also the place to put in your project specific assets, like additional DLL's or LabView VI's. Feel free to add more sub folders / LLB's / DLL's or VI's. But do **not** place your specific assets into one of the existing standard sub folders, since they get replaced by each LTT software update!

| Item                      | Description |
| ------------------------- | ----------- |
| IRS.MesSy                 |             |
| IRS.MesSyFD               |             |
| IRS.Mod                   |             |
| IRS.LTT.Mod.API.lvlibp    |             |
| IRS.LTT.Mod.Loader.lvlibp |             |
| IRS.LTT.Mod.Test.exe      |             |
| IRS.LTT.TS.API.lvlibp     |             |
| IRS.LTT.TS.UserLib.lvlibp |             |
| IRS.Rendezvous.lvlibp     |             |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.irs.systems/ltt/documentation/ltt-gui-manual/teststand/folderstructurets.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.