Questions about KVM

I have a few questions about KVMs

  1. Are built-in KVM switches in monitors just as good as stand alone KVM switches/docks?

  2. Do Level 1 KVM switches have EDID? Do I need EDID?

  3. Is it better to have a KVM switch dock with DisplayPort in/out than HDMI in/out?

Also, does a KVM allow you to move a file from one computer to another?