Using Sabre from a PC how do you submit a mask once it’s filled out? I’ve tried every logical keystroke I can imagine and nothing seems to work. What sorcery do I need to submit an RF 100?

Type the RF entry into DECS eg RF 100 VAC

You need to get to the top left corner now. Press HOME on a keyboard or click/tap the top left (iPad).

Press Escape twice to get inside the RF field.

Tab and Shift-Tab to move between fields.

Once everything is filled out, tab the cursor next to "DONE" and press Enter.

Worked, Thanks. Who came up with this ridiculousness?

Someone in 1970. Seriously.