>>>CAN WE HACKED THE PASS OF WIFI WLAN. IF THIS SO PRO?
It depends on the protection that you choose.
Examples:
a) hidden ESSID: trivial to hack
b) MAC filtering protection: quite easy to hack
c) WEP protection: requires a bit of WiFi know-how but it is feasible
d) WPA protection: very difficult to hack if password is strong, requires powerful hardware and a lot of time
e) WPA2 protection: not possible to hack with current technology if the password is strong enough