I'm running IBM Host On-Demand on my Mac. I haven't found a way to enter PF Keys other than through clicking on the virtual keyboard in the application. Other 3270 emulators such as Brown University tn3270 allow for command+number key for PF key function. Is there a way to something similar on Host On-Demand? It is really slow to have to to use a mouse for function keys.
Sorry to ask a stupid question, but --- have you tried hitting Fn-Fnn (use the Fn key in the lower left)? That's what I've had to do to use PF keys on HOD on my Macbook.
You can also set that behavior as default in the MacOS settings: under Keyboard, there's a checkbox that says "Press Fn key to..."