What does the clutch on a car actually do? Put simply, the clutch is the mechanical device which transfers the rotational power from the engine to the wheels in any manual vehicle. The clutch is the part of the car which connects two or more rotating shafts.
Lantus is a brand name medication marketed by Sanofi-Aventis consisting of insulin glargine. This is a prescription diabetes medication, and it is a long-acting form of insulin. This type of insulin is not recommended for the treatment of diabetic ketoacidosis, as short-acting and intravenous insulin is preferred for the treatment of that condition.
So the manufacturer of Lantus recommends it should not be mixed with any other type of insulin in the same syringe. One easy way of making sure you don't mix Lantus with any other insulin is to take the Lantus with a vial and syringe (no Lantus pen cartridge is yet available), and take the other insulin with a pen.