1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:

procedure inetstarten;
var
  dwConnectionTypes: DWORD;
begin
  dwConnectionTypes := INTERNET_CONNECTION_MODEM + INTERNET_CONNECTION_LAN +
    INTERNET_CONNECTION_PROXY;
  if not InternetGetConnectedState(@dwConnectionTypes, 0) then
    // not connected
    if not InternetAutodial(INTERNET_AUTODIAL_FORCE_ONLINE or
      INTERNET_AUTODIAL_FORCE_UNATTENDED, 0) then
    begin
      // error
    end;

    end;					

1:

InternetAutodialHangup(0)