In other words you don't have to do a darn thing to keep it functioning after the initial programming. The body however releases the sugars at different rates throughout the day. The pump takes this into account. Common methods include counting calories or carbohydrates. All the insulin in my pump is plain, dull, Regular insulin.
Some pumps use a special buffered Regular insulin.
The insulin is stored in a vial inside the pump that hold approximately 300 units. The vial is changed whenever it runs out, independent of the infusion set. The insulin vial is connected to a tube who's length varies depending on personal preference. I personally prefer mine long so that when my pump drops, it will fall to the floor without pulling on the infusion site. The infusion method also contains a hint of personal preference.