> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/support-us/verifone-hq/vhq-parameter-management/configuring-parameter-definitions-for-applications.md).
# Configuring parameter definitions for applications
This section discusses configuring Parameters for applications in VHQ.
{% hint style="info" %}
**Use this when** you need to upload the parameter definition (.vpdx) file for an application so its parameters can be managed in VHQ.
{% endhint %}
As part of the VHQ parameter management process flow, application developers build a *Parameter Definition* file that defines all parameters of the application and their attributes.
The *Parameter Definition* file is an XML file with the .vpdx extension. It defines:
* Names of application parameters, their organization into groups, and default values.
* Name of the parameter file on the device.
* Format and structure of the parameter files on the device.
## Configure parameter definitions for an application
{% stepper %}
{% step %}
### Open the Applications Library
Go to **Device Management** > **Manage Downloads** > **Applications Library**.
{% endstep %}
{% step %}
### Click Configure
Click **Configure** in the *Parameter Definitions* column for the selected application. Choose one of three options:
* **New**: Browse to select and import a new parameter definition file.
* **Reuse from other versions**: Select the parameter definition file from another version of the application.
* **None**: No parameter definition file is selected.
{% endstep %}
{% step %}
### Browse and select the file
You can view the parameters of the file, but they can't be edited from this screen.
{% endstep %}
{% endstepper %}
{% hint style="info" %}
The *Parameter Definition* file can only be uploaded once.
{% endhint %}
{% hint style="info" %}
**Example**: You imported the parameter definition file for App1 version 1.0. A new version, App1 1.1, becomes available with issue fixes but no parameter changes — you can reuse the parameter definitions already set up for App1 1.0.
{% endhint %}
Keywords
Also called: parameter definition file, .vpdx. Search terms: reuse from other versions, applications library.
---
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