[libvirt] Regarding connecting to libvirt from windows

Hi, I can connect to libvirt over TCP/IP from windows and call all the functions. what i want is to do some kind of authentication like entering some kind of username/password. im using virConnectOpen(const char* name) function. i tried using virConnectOpenAuth().. but whatever parameter ii give it gets connected and there is no option to pass username/password. Thanks in advance. Regards Anuj