> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pads4.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Interactivity properties

The **Interactivity Properties** control how interactive presentations respond to **user inactivity** and define how **keyboard navigation** is handled during playback.

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## **Page Keyboard Navigation**

### **Enable Navigation by Using Keyboard Keys**

When enabled, users can **navigate between pages** of your presentation using the keyboard on the **PADS4 Viewer PC**.\
Below are the available navigation keys:

| Keyboard Key                         | Action                          |
| ------------------------------------ | ------------------------------- |
| Left arrow / Up arrow / Page Up      | Switch to the **previous page** |
| Right arrow / Down arrow / Page Down | Switch to the **next page**     |
| Home                                 | Switch to the **first page**    |
| End                                  | Switch to the **last page**     |

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## **Expiration (Automatic Page Expiration)**

### **Automatic Page Expiration**

When enabled, the presentation will automatically perform a specified action if **no user interaction** (mouse click or key press) occurs within a defined period.

### **After x Second(s)**

Set the **number of seconds** of inactivity before an action is triggered.

### **Return to Page**

Specify which **page to return to** when the expiration time has been reached.\
This is typically used to return to a **home** or **welcome** page after a user has left the interactive presentation.

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### **Tip**

Setting expiration properties is especially useful for **interactive kiosks** to ensure that the presentation **resets to a default page** when no user is interacting.

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## **Remarks**

* If **Enable Navigation by Using Keyboard Keys** is turned on, **page durations** still apply.\
  For example, if a page is set to display for 30 seconds and no keys are pressed, the system will automatically **switch to the next page** when the duration ends.
* If **Synchronize Viewers** is enabled for a presentation, **interactivity functions** such as keyboard navigation and automatic page expiration **will no longer work**, since the presentation must remain in sync across all displays.