[Neftali [Germán.Estévez]]

Revisa la API wNetAddConnection2

Puedes conectar una unidad de Red y luego desconectarla:

Código Delphi [-]
 procedure TForm1.Button1Click(Sender: TObject);
 var
   NRW: TNetResource;
 begin
   with NRW do begin
     dwType := RESOURCETYPE_ANY; lpLocalName := 'X:';
     // map to this driver letter
     lpRemoteName := 'MyServerMyDirectory';
     // Must be filled in. If an empty string is used,
     // it will use the lpRemoteName.
     lpProvider := '';
   end;
   WNetAddConnection2(NRW, 'MyPassword', 'MyUserName', CONNECT_UPDATE_PROFILE);
 end;