Good references for ANSI terminal emulation?

[Michael B. Brutman]

Ok - here is a nice, specific question ..

This chart can be found at http://vt100.net/docs/tp83/appendixb.html . 
It shows the codes generated for the arrow keys.


Cursor Key Codes Generated

                  ANSI Character Generated
Cursor       Reset(Cursor)         Set (Application)
Up        ESC [ A                    ESC O A
Down      ESC [ B                    ESC O B
Right     ESC [ C                    ESC O C
Left      ESC [ D                    ESC O D


There are two columned - one for RESET and one for SET.  In my nice 
simple universe, I press a key and a series of codes gets sent to the 
host machine.  So what does it mean to Reset or Set in this context?

I think I want to use the first column, but what does the second column 
mean?


Thanks,
Mike