An image forming apparatus in which information regarding used amounts in image forming apparatus main bodies of different features is stored in the storage part of a cartridge, and the interchange time of the cartridge is judged by the use of the information. The protocol interface includes an interface to a header handler function associated with the client process. These conditions comprise, for example, Attention Deficit Hyperactivity Disorder, Obsessive-Compulsive Disorder, Psychoses, Substance Abuse, Substance Dependence, Parkinson’s Disease, Parkinsonism, Tardive Diskinesia, Gilles de la Tourette Syndrome, Conduct Disorder, and Oppositional Defiant Disorder.