var
  Computer: array [1..500] of string[25];
  ComputerCount: Integer;

procedure FindAllComputers(Workgroup: string);
var
  EnumHandle: THandle;
  WorkgroupRS: TNetResource;
  Buf: array [1..500] of TNetResource;
  BufSize: Integer;
  Entries: Integer;
  Result: Integer;
begin
  ComputerCount := 0;
  Workgroup := Workgroup + #0;
  FillChar(WorkgroupRS, SizeOf(WorkgroupRS) , 0);
  with WorkgroupRS do
  begin
    dwScope := 2;
    dwType := 3;
    dwDisplayType := 1;
    dwUsage := 2;
    lpRemoteName := @Workgroup[1];
  end;

  WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY, 0, @WorkgroupRS, EnumHandle);

  repeat
    Entries := 1;
    BufSize := SizeOf(Buf);

    Result := WNetEnumResource(EnumHandle, Entries, @Buf, BufSize);
    if (Result = NO_ERROR) and (Entries = 1) then
    begin
      Inc( ComputerCount );
      Computer[ ComputerCount ] := StrPas(Buf[1].lpRemoteName);
    end;
  until
    (Entries <> 1) or (Result <> NO_ERROR);

  WNetCloseEnum( EnumHandle );
end;