The following description relates to interactive mode only.
In L mode, all the F keys have the same effect as [DUE], irrespective of whether RDATA (input prompt is *) or WRTRD (input prompt is the line number) is used for reading.
The [DUE2] key transfers the entire screen content including any [LZE] characters and end marks that may be present. In EDT, this system characteristic may cause multiple lines to be inserted in the current work file. Since this is not usually desired, the [DUE2] key should not be used for entry in L mode.
In L mode, the [F1] key is used to enter a blank line (line of length 0). To do this, [F1] or [EM] [F1] should be entered at the input prompt. In contrast, if only [DUE] or [EM] [DUE] is entered, the input is ignored (as in the past) and the input prompt is displayed again. If other characters are entered in addition to [F1] or [EM] [F1] then [F1] has the same effect as [DUE].
If any of the K keys other than [K2] is entered then all the characters entered at the screen are ignored and the input prompt is displayed again.
[K2] causes EDT to be interrupted and processing switches to system mode unless this is prevented by the system settings (see section “Interrupting an EDT session”).