NORMAL MODE

  In this mode, basically whatever you type at the keyboard will be sent to
  the screen. Note, however, that text is not inserted - if there is already
  something below the cursor where you are typing, it will be overwritten.
  However, there are some special keystrokes to help with this editing:

    <Ctrl>+<RightArrow> .. Insert a space before the current character
                           position moveing everything else up one column.
    <Ctrl>+<LeftArrow> ... Delete the current character, moveing the rest
                           of the line left one column.
    <Ins> ................ Same as <Ctrl>+<RightArrow> except that it only
                           effects the current sentence..
    <Del> ................ Same as <Ctrl>+<LeftArrow> except that it only
                           effects the current sentence..
    <Shift>+<RightArrow> . Shifts the entire screen right one column start-
                           ing at the current column. A blank column in the
                           current background colour is inserted.
    <Shift>+<LeftArrow> .. The current column is deleted and the screen to
                           right of it is shifted left one column. A blank
                           column in the current background colour is
                           inserted in the last column.
    <Shift>+<DownArrow> .. Shifts the entire screen down one line starting
                           on the current line. A blank line in the current
                           background colour is inserted.
    <Shift>+<UpArrow> .... The current line is deleted and the screen below
                           it is shifted up one line. A blank line in the
                           current background colour is inserted at the
                           bottom of the screen.

    . A sentence is defined as a string of words seperated by no more than
      on space.

  Other than these basic editing keys, there are also a number of special
  operations that can be performed in this mode. These will be explained
  in detail below.