Equipment for use in changing a catheter, preferably of the type used for drainage of the urinary tract. The system controller includes an application controller which is adapted to be connected to the network and stores a plurality of system points corresponding to a plurality of system variables relating to the network devices. In addition, a device for implementing the method is provided. The interface may communicate with a user. The inter-process communication mechanism includes a command that provides for transmission of a message from the first process to the second process to request creation of a direct buffer that is mapped from both the first process and the second process to a common memory area.