Yes. (End Of) No Question About It. You Do. :P
There is no such think as modded gun but there is a modded controller.
no because on ps3 you need modded profile data
All you need is a USB and Jailbreak and Awesome File Manager,.
by acquiring a modded controler
No.
You have to jailbreak your PS3 otherwise you cant. but its hard to find a jailbreak download without a survey
no, but most people have the "UAV" hack on which allows them to see everyone on the map
No,you are really n00b. JTAG is for Xbox360 and JailBreak is for PS3,everybody should know that =) But no,you don't need JB/JTAG for CVAR Tool.
They host they modded lobbies with a diffrent xbox called a jtag. It is an that can run homebrwed unsigned code. Basically it is a hacked xbox 360 which gives you full control over your xbox. You can then mod games like MW2 and Halo.
Modded lobbies have now been patched in MW2. I suggest you don't mod as it could lead to your account being banned.
yes
you can u need to add their name / code depending on your console and then you go to menu and invite player