the only way you can hack into a private server easily is to use a cheat client
all you have to do is type the ip of the server which is somtimes shown on runelocus
and then you can be invisible make monsters attack you etc
if you are doing the global npc attack it only works on certain servers make your self invisible so u dont get banned lol i have put the youttube video and link below :)
YouTube - using bomb's cheat client on moparscape!
for some reason no links show on this so type in youtube bombs cheat client
happy hacking -mystereo-