Enter Space

  Inserts or overstrikes a space character at the current cursor
  position, depending on whether the current editing mode is insert or
  overstrike, as shown in the status line.

  If the cursor is past the right margin and wrap mode is set, the
  Enter Space key performs a line-fill operation on the current
  line.  You can change the right margin with the SET RIGHT_MARGIN
  command.

  Command Equivalent:

 	 ENTER SPACE

  Related Topics:

          ENTER LINE
 	 SET WRAP