Minecraft Forge is a mod management system for Minecraft, that allows the dynamic loading of other Mods, as well as basic dimension, blockID and itemID handling.
Once a player has installed Minecraft Forge, player can install any mods that are compatible with either Minecraft Forge, or Forge Mod Loader.
Pre-Minecraft 1.6.1 Installation[]
Search %AppData% and get to the following directory: /Roaming/.minecraft/bin
Open minecraft.jar in Winrar
Delete META-INF folder in minecraft.jar
Extract all files from the downloaded forge rar file into minecraft.jar
Open Minecraft normally
A box is popped out on the left bottom corner of game screen.