# subWorker Types

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**Good to know**

The images in this section are taken from the [Workers Fundamentals](/getting-started/example-projects.md) example project.
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## Statically-Linked subWorkers

Whenever you add a Worker to another Worker using the [Create/Add Worker](/workers-tools/workers-tools-menu/create-add-worker.md) tool, you will be adding the Worker as a statically-linked subWorker.

The Main VI of a statically-linked subWorker will appear below the QMH of the Worker that you are adding the subWorker to, as shown below.

![Main VIs of statically-linked subWorkers located below a Worker's QMH (Workers Fundamentals example project)](/files/s3FwlqxuWTYJt2t70wXp)

Within an application's Worker call-chain hierarchy diagram, you can identify statically-linked subWorkers as subWorkers **without** an outer dashed line. The Workers in the red box below represent the statically-linked subWorkers in the block diagram above.

![Statically-linked subWorkers of Worker A.](/files/ixwJw3yTFqYZTPmNkXVz)

## Dynamically Loaded subWorkers

Workers can also be integrated into a Worker's call-chain hierarchy at run-time, by loading a Worker dynamically from another Worker by using the Workers palette VI: *Dynamically Load Worker v2.vi.* This VI is used within the [Dynamically Load Worker Public API](/workers-tools/workers-tools-menu/public-api-builder.md#create-dynamically-load-worker-vi) VIs. An example of a Worker that is loaded dynamically at run-time is shown in the image below. Here you can see that Worker D is loaded dynamically by another Worker, and its returned Worker object is stored in the [Main Data Wire](/fundamental-concepts/important-terms.md#worker-main-data-wire) of the Caller.

![Worker D is dynamically loaded from Worker A (Workers Fundamentals example project)](/files/FhZxYoPAAjoMO7VdIh7r)

Within a Workers call-chain hierarchy diagram, you can identify a dynamically loaded subWorker as a subWorker **with** an outer dashed line. The Worker in the red box below represents the dynamically loaded subWorker in the block diagram above.

![Dynamically loaded subWorker of Worker A](/files/EM7NAv34jJDxk15T7YVB)

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Dynamically loaded Workers are loaded with LabVIEW's *Start Asynchronous Call* node, using flags: 0x100 flag (Call and Collect) and 0x40 (Enable simultaneous calls on reentrant VIs).
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