A system and method for developing a dynamic web page. The parallel data streams are synchronized and formed into one or more groups of synchronized parallel data streams. Uplink ports of the node boards are logically grouped into trunk ports at one end of the communication link with the switch fabric boards. The flag moves into the deployed condition in response to the swimmer pulling on the pull, so that the flag is pulled out of the wristband and may be waved to signal distress. Using the injection apparatus, the monitoring of pulsation and the injection of contrast media can be conducted under no radiation exposure and, moreover, the injection of contrast media can be conducted simply without requiring the complex operation of valve switching. In a medium that recordsplays back data including video data and control information, the control information includes information for accessing a specific portion of the video data.