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function ConnectNetworkDrive(const ADrive: String;
  const ADirectory, AUsername, APassword: String;
  const ARestoreAtLogon: Boolean ): Boolean;
var
  NetResource: TNetResource;
  dwFlags:     DWORD;
  lPwd, lUser: PChar;
begin
  NetResource.dwType:=RESOURCETYPE_DISK;
  NetResource.lpLocalName:=PChar(ADrive);
  NetResource.lpRemoteName:=PChar(ADirectory);
  NetResource.lpProvider:=nil;

  if ARestoreAtLogon then
    dwFlags:=CONNECT_UPDATE_PROFILE
  else
    dwFlags:=0;

  if AUsername<>'' then
    lUser:=PChar(AUsername)
  else
    lUser:=nil;

  if APassword<>'' then
    lPwd:=PChar(APassword)
  else
    lPwd:=nil;

  Result:=WNetAddConnection2(NetResource,
                             lPwd,
                             lUser,
                             dwFlags)=NO_ERROR;
end;                    

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procedure TForm1.Button1Click(Sender: TObject);
begin
  if ConnectNetworkDrive('X:','\\computer1\laufwerk (d)\alt', '', '', False) then
    Showmessage('Netzlaufwerk konnte erstellt werden')
  else
    RaiseLastOSError;
end;