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Accessing application section from boot program

I am working with Atmega128 and i want to write a program that enters the boot section when a particular pin is low and after executing boot program looks in the application area of Atmega128. If some program is present there i want to erase it.
Up till noe i have managed to cause the program to enter in boot section and execute the code. But further i have no idea how can it make a search for the presence of some code in application area and then to erase it.
Thanks in advance.

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