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помогите!! обьясните популярно этот код программы! особенно выделенные места!

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;
type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    Edit1: TEdit;
    Image1: TImage;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure ListBox1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  a: integer=0;

implementation

{$R *.dfm}
function UpCaseAll(x: string): string;
var
  b, w: integer;
  str: string;
begin
  for w := 1 to length(x) do
  begin
    b := ord(x[w]);
    case b of
      0..96: x[w] := chr(b);
      97..122: x[w] := UpCase(chr(b));
      123..183: x[w] := chr(b);
      184: x[w] := chr(168);
      185..223: x[w] := chr(b);
      224..255:
        begin
          b := b - (Ord('а') - Ord('А'));
          x[w] := chr(b);
        end;
    end;
    str := str + x[w];
  end;
  UpCaseAll := str;
end;


procedure TForm1.FormCreate(Sender: TObject);
begin
ListBox1.Items.LoadFromFile('films.txt');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Close;
end;
procedure TForm1.ListBox1Click(Sender: TObject);
begin

memo1.Lines.LoadFromFile('myl/'+Listbox1.Items[ListBox1.ItemIndex]+'/'+Listbox1.Items[ListBox1.ItemIndex]+'.txt') ;
end;

procedure TForm1.Button1Click(Sender: TObject);

var
  st, st1: string;
  f, i: integer;
begin
  st := UpCaseAll(Edit1.Text);
  if st <> '' then
  begin
    for i := a to listbox1.Count - 1 do
    begin
      st1 := UpCaseAll(Listbox1.Items.Strings[i]);
      repeat
        f := POS(st, st1);
        if f <> 0 then
        begin
          Listbox1.ItemIndex := i;
          a := i + 1;
          exit;
        end;
      until f = 0;
    end;
    a := 0;
  end;
end;

end.

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