What is on the Screen

If you are in the editor now, looking on the screen you should see on the
top 3 lines :-

     1) The name of the current file.
     2) The current folds tag just below that.
     3) A blank line below that (where prompts and error messages appear).
     4) The language name (probably top) for the current buffer.
     5) The current line and column numbers at the top right.
        The line number is the 'flat' line number (ie: over the whole file).
     6) One or more of the words 'autoindent', 'overtype' and 'insert'.
        These specify the current editing mode.
     7) Either ^I or a number specifying either the number of spaces
        per press of the tab key or that real ^I tabs are in force.

You will see the current fold of the file being edited on the lines below
this.

Lines before the first line of the fold are displayed as ~'s in classic
UNIX vi(1) style. The same applys to lines beyond the bottom of the fold.
The last line in the current fold is displayed as a caret ^.

eg:  A typical screen might look like this :-

     upper.c                                          c          1 1
     inner loop                                           insert  ^I
                                                                    
     ~
     ~
     ~
     while ( (c = getchar()) != EOF )
             putchar(toupper(c));
     ^
     ~
     ~
     ~