Canon Cat Reference Manual page 30

Erase
Turnaround
Forward
erase
or backward
erase
change
direction when
the
cursor
reaches
either end
of
the
text. This
is
called
erase
turnaround.
Backward
erase
switches to
forward
erase
when you
erase
the last character separating the cursor
from
the
initial
documentcharacter, or,
iflocal
leap is on, the
lastcharacter
separating the
cursor
from
the
beginning of the
local
leap
region.
Forward
erase
switches
to
backward erase
when you erase
the last character separating
the cursor
from the final
document character, or,
iflocal
leap is
on, the
last
character
separating
the
cursor
from
the end
of
the
local
leap
region.
Erasing Highlighted Text
If
you
press [ERASE]
when the
highlight
is extended,
all the
text
contained
in
the extended
highlight
vanishes.
The
cursor is
left wide, with
the
normal-sized
highlight resting
on the
first
character
that preceded
the
extended
highlight.
UNDO and Erasing
IUNDO] restores all
erased
characters
to the
screen.
Ifthe
highlight
was
extended before erasing,
it
will
be
extended
after you undo
the erase.
The screen
will
look exactly
as
it
did before you
pressed
[ERASE].
You
cannot undo
the erasure once
you've
pressed a
key
other than
[UNDO]
after erasing.