Presuming you need to show your POS transaction activity to your customer, DealPOS provides that feature, it's called Customer Display. You can open the link to get to know more about Customer Display.
As we know, Customer Display can be opened by display.dealpos.app. But we can also Install a Plugin to open it faster. This article will explain how to install it into your browser with our built-in plugin in Google Chrome so you do not have to drag it manually to your second screen.
I. Install the plugin
Step 1. Open display.dealpos.app

Step 2. Click the plugin button and install it

Step 3. A new window will appear

Note: You need to move it to your second screen once, and every time you open it, it will appear on the second screen.
II. Open the installed application
Step 1. The plugin is automatically added to your desktop:

Step 2. You can also run the application installed by clicking these plugin buttons in display.dealpos.app:

You might also like to read these articles below:
You can also read about Setup Customer Display and Connect with POS
You might also like to read the Order Display System Configuration.
In case your business type is engaged in Food and Beverages, you can also show your orders to the kitchen with Order Display.