Mem location x:  
..........
..........      <<- Main compiled Hex file goes here          
..........          which is executing and handeling   
..........          all the process. including when  
..........          the developer requests to load
..........          his code with a command.
Mem locaion xn:     

when requested the above firmware loads the user firmware here

Mem location Y:
..........
..........
..........     <<----- This code is given an independent time 
..........             slot to do what ever it require  
..........             including calling pre built functions
..........             from the main program if possible. 
..........
..........
Mem location Yn: