What would be 'submit' then?

Enter/return on the 'Submit' button, I suppose. The rationale may have been "Start at the beginning of the form, keep hitting Enter after filling in each field, and it will submit itself when you're done."

	▲	drivers99 8 hours ago \| parent [-]
		Some terminal software would use a function key that would be labelled "Execute". You'd usually have a template to put over the function keys to tell you what does what.