Desktop drawing not on canvas

sir,
how can we draw directly on the desktop (not ordinery drawing using canvas or in an application).This is possible using VC++ and has implemented in the site gotomypc.com .
What I want to do exactly is whenever I just drag the mouse on my desktop (not in any of the application)the pixels correspond to the mouse pointer should change to different color.For this there may be one java program which wait for the mouse event (not ordinary java.awt.event s or ordinary swing events )

I hope I understand your question, but I will try to answer.
Using VC++ there is an application running, and that is the OS. So, the fact that you can draw directly on the desktop is not surprise.
In order for Java to work there must be an application running, and all drawing is done within it's window(s).
Now, if you create your own desktop that is a java application, then you can simulate what you want to do.

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