Either the input or display area can be used as the edit area. Often the number of lines in an input string exceeds the number of lines available in the edit area display. When the input string is longer than the input area, the DOWN command is used to generate additional lines for entering commands. The DOWN command moves this window down over the input.
The DOWN command is not effective when the last line of the input string is the first line in the edit area (that is, the end of the input string is reached).
If the input area is the edit area, the DOWN command can only be executed by PF 24 key, or a user-assigned PF key.