This kind of things are very useful in today's applications, because in the PDA, in the Personal Digital Assistance, are becoming widely used, are being widely used and that is being done in a variety of applications. The consumer applications for example where you have a picture and you want to do some changes on it, like colour changes, you want to do some touch-ups to remove some blemishes or to enhance certain parts of the image to improve the quality of the image. Or the same thing can be done in video case, not image case, where you want to have special effects, remove certain objects from the image and so on, from the video an so on. Similarly in medical applications you want to communicate to a doctor, two doctors might be communicating say "this is the tumour you are interested in". So they are really communicating the contents of the image, and this communication is happening by for example pointing to the contents of the image on the PDA. For example, they might be delineating a tumour, identifying a tumour in the process of communicating with each other. Similarly they will want to tracking a cell across the video sequence. Similarly there are military applications, where the military might be interested in planning operations and for that they need discussion, for that they need references to the map, so they might be pointing to the map, and then communicating about the plans.

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