to view a video source without interruption due to the absence or termination of another vis 204 fig3 is a flowchart describing the steps executed by the video system 200 the process begins at step 300 when the video system 200 is powered up or initialized at step 310 the vdc 230 monitors the arrival or if already present termination of one or more video signals i e vis 204 from one or more video sources at step 320 the vdc 230 determines whether one or more new vis 204 are detected at an input port hence if one or more vis 204 are already present the vdc 230 takes no affirmative action the vdc 230 returns to the monitoring step at 310 the duration of time between two consecutive monitoring steps may be determined and programmed as desired by the system operator on the other hand if the arrival of one or more new vis 204 is detected at step 310 then the process proceeds to step 330 at step 330 the vdc 230 generates one or more interrupts to notify the mpc 220 of the presence or absence of one or more vis 230 at step 340 the mpc 220 records the one or more interrupts and determines if more than one vis 204 is detected if the arrival of only one vis 204 is detected and no other vis 204 are active then the mpc 220 may automatically.