Redirecting Process Flow
As mentioned earlier, a program is a set of instructions that the processor will perform. Most programs consist of a main program that calls various subprograms (called methods, functions, subroutines, and so on) in order to perform specific tasks. For example, a program may need to draw a window multiple times during its execution, so rather than rewrite the same code repeatedly, a programmer will write a function that draws a window and name it something like DrawWindow. Then, whenever the program needs to draw a window, the main program can simply call (refer to) the DrawWindow function in order to accomplish that goal.
Remember that before a program can run, the computer must allocate the resources that the program ...
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