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graphics card - Split monitor into virtual monitors - Super User
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How To Split a 4K or Ultrawide Monitor Into Multiple Virtual Monitors
Amazon.com: Trio Max Portable Monitor for Laptop, Mobile Pixels 14.1" Full HD IPS Display, Dual or Triple Laptop Monitor Screen, USB A/Type-C Plug and Play Monitor for 13”-17” Laptops(1x 14.1 Monitor) :