Advanced Inventory Management

By combining two hoppers and an Experience Relay, xp can constantly be pulled out as bottles o' enchanting, so that the player can't lose his experience when he dies.

By combining a hunger relay with a hopper and a chest full of food, you can supply the player with food when he is hungry, removing the need to eat constantly. (Especially useful during combat when food is needed to regenerate health)

A more complex network containing multiple devices connected by network cables.

The crafting recipe for the Inventory Management Manual

By connecting a player monitor set to display health mode with a potion relay, you can send healing potions to the player whenever his health is not at maximum