During the battle, using the interface (especially hotkeys), we can instantly use the items and skills that we have. Used in a good moment, they can do wonders. Acquiring them is described in another chapter, so in this one, we will only talk about their practical use. During the battle, we can only have 4 specific types of items assigned to the hotkeys (but stacked in large amounts) and 4 skills. After every use, a cooldown appears, after which we can use the item/skill again. We can of course use various items at the same time, if we need to. Items are limited by the number of them available in one stack (for example 30 repair kits), but skills are limited by a totally different factor, which is the player's mana bar (called MP in this game). When the bar is low, we cannot use any skills. Fortunately, this doesn't happen frequently, because the bar regenerates quite fast on its own and items that refill the bar are relatively cheap.
It is also worth mentioning that we can use skills and items not only on ourselves, but also on our allies and enemies. A few simple examples: The repair kit can fix our tank, but we can also use it on our friend's machine. The same for the Artillery Deflection, which can work on us and our team members. The skill that creates a shock wave in the shape of a triangle will work only on our enemies and doesn't interact in any way with our allies. As for our team, it will be good to talk about one important rule. Under no circumstances should we rush into battle on our one, in the style of Rambo, because in this game, intense firepower is even more important than good co-operation. In other words, you should always stick together with your team members.