Once you are at the main menu or in-game, press the activation key (usually F1 or Home ). You should hear a "Trainer Activated" voice or sound.
A trainer is a third-party program that runs alongside the game, allowing you to modify memory values in real-time. This translates to "cheats" like infinite health, money, or ammo. Key Features of the Build 091 Trainer jagged+alliance+back+in+action+build+091+trainer
Most trainers for this specific build offer a "num-pad" style interface with the following functions: Once you are at the main menu or