INSERT MODE

 (Default.)  Sets the mode of the current buffer to insert, as opposed to
 overstrike.  As you type, the new text is inserted at the current
 position, pushing existing text to the right and down.

 Usage notes:

 o  The mode of the buffer is shown in the status line.  It also affects
    some commands and keys such as DELETE, ERASE CHARACTER, and RESTORE
    CHARACTER.  For a list of these commands and keys, see help on CHANGE
    MODE.

 o  If you use SET BOX NOPAD, the mode of the buffer determines the effects
    of some box editing operations.  In insert mode, cutting a box, or
    erasing a box selection with pending delete, makes text to the right of
    the box "collapse" to the left, closing the gap, and pasting or
    restoring a box pushes existing text to the right.  To override these
    effects, use BOX CUT OVERSTRIKE and BOX PASTE OVERSTRIKE.

 o  The Insert or Overstrike indicator on the status line is a toggle
    button---clicking MB1 on the indicator is the same as using CHANGE MODE
    (CTRL/A).  See help on Status Line.

 Related topics:

    Status Line     CHANGE MODE     OVERSTRIKE MODE     SET BOX NOPAD