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[pd]

Simple way to describe it, cause I know what it's like when you hear about includes the first time...

Imagine you write your INI code down in a file, mark all it's content and copy-and-paste it into your rulesmd.ini.
That's what includes do: copy a whole file's content and paste it in the file it's invoked in.
So if you put the [VehicleTypes] list and the vehicle sections into vehicles.ini and your rulesmd.ini includes that vehicles.ini file, the game will act as if [VehicleTypes] and the single sections were in rulesmd.ini.

Advantage: You can use this to keep stuff well ordered.
I know I'm going to.

[DCoder]

Just a note: lists such as [VehicleTypes] should NOT reuse indices unless you understand what will happen.

[pd]

Are sections with equal names actually merged?
That would own even more!!

I don't use indices usually but I tend to set it like MTNK = MTNK - the game allows it and the numbers are gone.

[DCoder]

Are sections with equal names actually merged?
That would own even more!!

Yes.

Code:

[General]; test1.ini:
KEY1 = VAL1
KEY2 = VAL2

Code:

[General]; test2.ini:
KEY2 = VAL4
KEY3 = VAL3

Code:

[General]; result:
KEY1 = VAL1
KEY2 = VAL4
KEY3 = VAL3

[Renegade]

* Renegade dresses up as a n00b and complains about VAL2 not being read