An image forming system which is capable of, when a manual stapling process is to be carried out on sheets, reducing waiting time for a user and decreasing power consumption. Therefore, a loss of an electric signal propagated through the signal electrode can be reduced. Next, the system receives an execution environment change notification from a user of the application, and in response to the notification transitions the application to a second execution environment without interrupting the execution of the application. And, the direction of elongation of one opening is substantially perpendicular to the direction of elongation of the other opening. The rate of tissue ingrowth increases as the porosity andor the pore size of the implanted devices increases.