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title: System (dw::System)
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# System (dw::System)

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

This module contains functions that allow you to interact with the underlying system.

To use this module, you must import it to your DataWeave code, for example, by adding the line
`import * from dw::System` to the header of your DataWeave script.

## Functions

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><a href="https://docs.mulesoft.com/dataweave/2.3/dw-system-functions-envvar">envVar</a></p></td><td><p>Returns an environment variable with the specified name or <code>null</code> if the environment variable is not defined.</p></td></tr><tr><td><p><a href="https://docs.mulesoft.com/dataweave/2.3/dw-system-functions-envvars">envVars</a></p></td><td><p>Returns all of the environment variables defined in the host system.</p></td></tr></tbody></table>