How do I start a 3270 or 5250 session and use function keys in the browser?

Start a session from Home; it auto-connects to the admin-configured host. Use F1–F12 and Shift+F1–F12 (F13–F24), the on-screen PF bar, Tab, and Enter. Customize mappings in admin Key Mappings. This is terminal emulation — not a Screener or Next map player.