The Lenovo Yoga 7i 15 model number 82BJ0001US, supports up to 3 independent displays via native display and 2 external monitors; supports external monitors via Thunderbolt 4 (up to 7680×4320@60Hz).

That will depend on the requirements and compatibility of the specific APP you want to use. The Lenovo Chromebook Duet, model number ZA6F0016US, ships with the Chrome Operating System and is compatible with Google Play Store APPs. We recommend you check with the specific APPs software publisher's web sites, of the APPs you want to use, for their compatibility with the Chrome 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.

No. There is no video out signal through the 1x USB-C 3.2 Gen 1 (support data transfer only) port within this configuration. This model uses 1x HDMI 2.0 version for video out to an external monitor. The IdeaPad Gaming 3 15 Laptop supports up to 2 independent displays via native display and 1 external monitor; supports external monitor via HDMI® (up to 3840x2162@60Hz). To connect two external monitors to this laptop you would need to add a universal USB 3.0 docking station like this one: https://www.bestbuy.com/site/j5create-usb-3-0-mini-docking-station-silver/5901250.p?skuId=5901250

The Lenovo IdeaPad 3 15 Laptop, model number 81WR000FUS, ships with Windows 10 S-Mode 64-bit 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. S-Mode also comes with Windows Defender Virus Protection Software built. If you want to use a 3rd party Virus Protection Software, The Lenovo IdeaPad 3 15 Laptop ships with a 30-day trial of McAfee Virus Protection Software installed. It will activate automatically with the initial activation of Windows 10 and protect your computer for the 30-day trial period. You do not need to use McAfee VPS. You can uninstall McAfee and use the free Windows Defender VPS that comes with Windows 10 or you can uninstall McAfee and then install your choice of any compatible 3rd party VPS. The key is to uninstall McAfee if you will not be using it, as there can only be one active VPS on the computer at a time. Here is a link to information on uninstalling McAfee from Windows 10: https://service.mcafee.com/webcenter/portal/oracle/webcenter/page/scopedMD/s55728c97_466d_4ddb_952d_05484ea932c6/Page29.jspx?wc.contextURL=%2Fspaces%2Fcp&articleId=TS101331&_afrLoop=1355161020222084&leftWidth=0%25&showFooter=false&showHeader=false&rightWidth=0%25¢erWidth=100%25#!%40%40%3FshowFooter%3Dfalse%26_afrLoop%3D1355161020222084%26articleId%3DTS101331%26leftWidth%3D0%2525%26showHeader%3Dfalse%26wc.contextURL%3D%252Fspaces%252Fcp%26rightWidth%3D0%2525%26centerWidth%3D100%2525%26_adf.ctrl-state%3Dx25crirbo_9. The IdeaPad 3 15 also ships with the Firmware TPM 2.0 integrated in chipset for added security.