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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;                    

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InternetAutodialHangup(0)