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On the Dell Latitude 5400 and 5410 Silver, pressing both the left and right mouse buttons simultaneously generally triggers a middle-click action, which is a common feature on many laptops.

COMPATIBLE FOR Dell Latitude 7390 and E7390, pressing both the left and right mouse buttons simultaneously typically triggers a middle-click action.

On the Dell Latitude 5300 (Silver), pressing both the left and right mouse buttons simultaneously generally triggers the middle-click action.

On the Dell Latitude 7300, pressing both the left and right mouse buttons simultaneously typically triggers a middle-click action, which is common on many laptops. This can be useful in different scenarios such as:

• Opening links in a new tab in web browsers (e.g., Chrome, Firefox).
• Pasting text in some applications.
• Triggering custom actions in other software.

On the Dell Latitude E5580 and E5590, pressing both the left and right mouse buttons simultaneously typically triggers the middle-click function. 

On the Dell Latitude E5270 and E7270, pressing the left and right mouse buttons simultaneously typically triggers a middle-click action, which can be useful in various scenarios, such as:

• Opening links in a new tab in browsers.
• Pasting text in some text-editing applications.
• Other actions depending on the software you're using.

On the Dell Latitude E7240 and E7440, pressing both the left and right mouse buttons simultaneously typically triggers the middle-click function.

On the Dell Latitude E5470 and E5570, pressing both the left and right mouse buttons simultaneously typically triggers the middle-click action. This is a standard feature across many laptops and can be used for various tasks such as:

• Opening links in a new tab in browsers.
• Pasting text in some applications.
• Triggering specific actions in different programs, depending on how the system or software is configured.

On the Dell Latitude E5480 and E5490, pressing the left and right mouse buttons simultaneously usually triggers a middle-click action, which can be useful in various scenarios such as:

• Opening a link in a new tab in web browsers.
• Pasting text in some applications.
• Triggering customized actions in certain programs.

On the Dell Latitude E7470, pressing both the left and right mouse buttons simultaneously typically triggers the middle-click action. This is a standard behavior on many laptops and is commonly used in various applications such as:

• Opening links in a new tab in web browsers (e.g., in Google Chrome or Firefox).
• Pasting in some text-editing applications.
• Performing other custom actions depending on the software or environment you're working in.

On the Dell Latitude E7480 and E7490, the mouse buttons (whether on the touchpad or external mouse) typically function as follows:

• Left-click: Press the left button (or tap the touchpad if configured) to select or interact with items.
• Right-click: Press the right button (or tap with two fingers on the touchpad) to bring up contextual menus.
• Middle-click: On many laptops, you can trigger a middle-click by pressing both the left and right mouse buttons simultaneously. This is often used for tasks like opening links in a new tab in browsers or pasting text.

On the Dell Latitude 5400 and 5410 (including the Grey versions), pressing the left and right mouse buttons simultaneously typically triggers a middle-click action. This action can be used for a variety of tasks, such as:

• Opening links in a new tab in web browsers.
• Pasting text in some applications.
• Triggering other functions depending on the software or system configuration (e.g., in some environments, it can be used for certain types of scrolling or custom shortcuts).

On the Dell Latitude E5450 and E7450, pressing the left and right mouse buttons simultaneously usually triggers the middle-click action. 

On the Dell Latitude E5280 and E5290 models, pressing both the left and right mouse buttons simultaneously generally triggers a middle-click action. This is typical behavior on many laptops and can be used for tasks such as:

• Opening links in a new tab in browsers.
• Pasting text in some applications.
• Scrolling or other specialized actions depending on the software.

Troubleshooting if Left+Right Mouse Click Isn't Working:

If pressing both buttons doesn't trigger the expected middle-click, here are a few troubleshooting steps you can try:

1. Check Touchpad Settings:

• Windows Settings: Go to Control Panel > Mouse > Device Settings (or Touchpad Settings depending on your configuration).
• Check if multi-touch gestures and button presses are enabled on the touchpad.
• Some touchpad drivers (like Windows Precision) allow you to enable or disable certain gestures, including the middle-click functionality.

2. Update Drivers:

• Make sure the touchpad drivers are up to date. Go to Device Manager > Mice and other pointing devices, right-click the touchpad, and select Update Driver.
• You can also visit the Dell support website and download the latest touchpad or mouse drivers for your specific model.

The Dell Latitude E7280, E7290, and E7390 models have a traditional touchpad, which includes a left-click and right-click functionality. However, if you're asking about the physical mouse buttons where you can press both the left and right buttons simultaneously, this is commonly associated with the "middle-click" action.

On the Dell Latitude E7250, pressing the left and right mouse buttons simultaneously typically triggers the middle-click action, which can have various uses depending on the application.

On the Dell Latitude E6440, like most laptops, when you press both the left and right mouse buttons simultaneously, it usually triggers the middle-click action. This action is commonly used in software environments to perform specific functions, like:

• Opening a link in a new tab (in web browsers).
• Pasting text (on some operating systems).
• Scrolling or other functions (depending on the application).