The I command inserts new text into the buffer at the current cursor
 position.

 Format: Itext to be inserted^Z
     or: I
 	text to be inserted
 	^Z

 If you plan to insert only a few characters, use the first form of the I
 command.  If you plan to insert several lines use the second form.  With
 the second form you can insert lines until you type control Z.  On
 VT100-type terminals the I command remains at the bottom of the screen
 to remind you that you are inserting text.  Only the first form of the I
 command can be used in a key definition or after C; in a macro or
 startup command file.