How terminal-sharing tools stream your shell to a browser

Tools like ttyd, TermPair, and sshx let developers share a live terminal in a browser via pseudoterminal (PTY) forwarding. They fork a shell, hold the master PTY end, and stream bytes over WebSocket or HTTP. Each tool implements this differently—ttyd in C, TermPair in Python, sshx in Rust—but all solve the same collaboration problem.