1. it is xterm, xterm.js to be sepcific
2. uses no-vnc. if you own the repl theres a way to set the vnc server password and access from your own client, but i forget how. probably on the replit docs/blog
Again, let me stress this: xterm.js is providing the console only. Any visual things, including the x64 window, are provided by the VNC connection, which is completely independent of the xterm console.