Flint and Steel

Flint and Steel is a tool used to place Fire in Indev, Infdev, Alpha, and Beta. It must be crafted from 1 flint and 1 iron ingot in this pattern:

Flint and steel places fire like a block when right-clicked. Fire can only be placed on top of fully solid and opaque blocks, or on the sides of flammable blocks.

A flint and steel has limited uses, but it is not a block-breaking tool and so does not lose durability from being used to hit things. If an incorrect placement is tried, it still counts as a use of the tool.

Uses
Flint and steel places fire which behaves just like any other fire. Particular ways in which this is useful are:
 * Creating portals.
 * Lighting mobs on fire. This method deals damage more slowly and is less effective than using a sword, and one must click on a block below the mob rather than on the mob itself, rendering it a difficult way to kill. However, when a pig is killed via fire it drops a Cooked Porkchop, carrying a Flint and Steel around allows a player to save their coal. Also this prevents degradation of the sword, as well as only requiring one use of the flint and steel.
 * Quickly clearing areas, by removing trees. This will save time and durability of axes.
 * Quick disposal of items, which can be accomplished by dropping the items and then lighting the block under them on fire.
 * Temporary illumination for a few seconds as the fire burns, or lighting netherrack on fire.
 * Using Netherrack and the disposal effect, an indefinite incinerator can be made without the need for lava.
 * Flint and steel, along with redstone, is the only way to activate TNT as of 1.7.

Trivia

 * In early versions of Indev, the player started with a flint and steel in their inventory. Flint and steel was also found as loot from killing mobs.
 * In the start of Survival Multiplayer, furnaces did not work. There was a mod that turned flint and steel into a "lighter" that lit the furnace and made it work.
 * Many online servers have banned the use of flint and steel as it can be used for greifing.
 * Before furnaces, flint and steel could be used to smelt ores.

Now try to set the highest block of the wall on fire on the side which is closest to the block you want to burn. This will result in: (Note that the furnace is on fire, not the wall.).
 * There is a way to set Workbenches, chests, furnaces, and dispensers on fire. Any other solid and opaque can be set on fire like this. To do this, copy the shown building (side view) (You can do this with any blocks, but the wall must be made of unflammable blocks, and all blocks must be solid and opaque blocks)