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unit Unit1;

interface

uses
  Windows,WinInet,Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
  If  InternetGetConnectedState(nil, 0) then
  Label1.Caption:= 'Online'
  else
   Label1.Caption:= 'Offline';
end;
end.                    

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function GetWindowsVersion: string;
var
  VerInfo: TOsversionInfo;
  PlatformId, VersionNumber: string;
  Reg: TRegistry;
begin
  VerInfo.dwOSVersionInfoSize := SizeOf(VerInfo);
  GetVersionEx(VerInfo);

  Reg := TRegistry.Create;
  Reg.RootKey := HKEY_LOCAL_MACHINE;
  case VerInfo.dwPlatformId of
    VER_PLATFORM_WIN32s:
      begin

        PlatformId := 'Windows 3.1';
      end;
    VER_PLATFORM_WIN32_WINDOWS:
      begin

        Reg.OpenKey('\SOFTWARE\Microsoft\Windows\CurrentVersion', False);
        PlatformId    := Reg.ReadString('ProductName');
        VersionNumber := Reg.ReadString('VersionNumber');
      end;
    VER_PLATFORM_WIN32_NT:
      begin
       
        Reg.OpenKey('\SOFTWARE\Microsoft\Windows NT\CurrentVersion', False);
        PlatformId    := Reg.ReadString('ProductName');
        VersionNumber := Reg.ReadString('CurrentVersion');
      end;
  end;
  Reg.Free;
  Result := PlatformId + ' (version ' + VersionNumber + ')';
end;                    

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Label1.Caption := GetWindowsVersion + ;                    

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Reg := TRegistry.Create;  
Reg.RootKey := HKEY_LOCAL_MACHINE;