the window 20 can also include a time line viewing pane 25 which can include time lines 26 27 28 and 29 for each of the cameras displaying video in the viewing panes 21 22 23 and 24 respectively when a user observes the person of interest for example in a video data stream the user can mark the corresponding time line with an in marking at the time when the person of interest is first depicted in the data stream when the person of interest no longer is depicted in the video data stream the user can mark the corresponding time line with an out marking that is the user can mark the appropriate time line with in and out markings at the exact entrance and exit times of the person of interest in a corresponding video data stream as seen in fig4 each time line 26 27 28 and 29 can be marked with a selected period of interest 30 33 36 and 39 respectively it is to be understood that any time line can be marked with more than one period of interest if for example the object of interest is depicted on the video corresponding to that time line more than once further it is to be understood that the selected periods of interest can be of varying lengths of time the length of time for any selected period of interest corresponds to the length of time that the object of interest is depicted on of the corresponding video data stream in fig4 each time line 26 27 28 and 29 has been marked in at times represented at 31 34 37 and 40 respectively each time line has also been marked out at times represented as 32 35 38 and 41 respectively the.