The Lenovo IdeaPad 3 14 Laptop, model number 81W0009DUS, is not user upgradable. A certified technician must do all of the work, so as to not void the warranty. We recommend you consult your certified technician about your storage upgrade options.

No. The Lenovo IdeaCentre 510A Desktop, model number 90HV0005US, has one VGA and one HDMI port for video out connections.

The Lenovo Duet Chromebook has a 10.1-inch screen, measured diagonally.

That will depend on the requirements and compatibility of the specific APP you want to use. The Lenovo IdeaPad 3 15 Laptop, model number 81WE00KVUS ships with Windows 10 S-Mode Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost. We recommend you check with the APPs software publisher's web site for their compatibility with Windows 10 S-Mode 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration. If you need to switch out of Windows S-Mode, here is a link to instructions for switching from Windows 10 S-Mode to Windows 10 Home: https://support.microsoft.com/en-us/help/4456067/windows-10-switch-out-of-s-mode