For every text block, the first number is the actor number, which determines basically what NPC, enemy, object, or other type of data you can physically interact with ingame is going to load. The second number is the group, which must be loaded on a map to load actors that share that group number. It is important to note that either group 0000 or 0001 (can't remember which) is always loaded, so you do not need to load these groups to get an actor of that group to load. Finally, under those two numbers are the variables for that actor--this basically determines what different type of monster or NPC will load; for example a white sitting Iron Knuckle versus a black standing Iron Knuckle. That's basically all you need to know.