VT100: EXT + U VT200: EXT + Remove
DEFINE_KEY Function: DVCNCL
Cancels the RECORD function. Use the DV CNCL function if you
begin using the RECORD function and then decide you want to stop.
If you want to delete a sequence that has already been recorded
on a PF key, use the RECORD function, press the PF key, and then
use the DV CNCL function.