There are two major differences between modal and non-modal programming. The first difference is in the amount of control you, the programmer, have over the order in which events happen. The second difference lies in what actually happens when a processing function, such as fm_proc(), is called. These differences seriously affect the way you need to write your applications. In order to design a good non-modal program, you need to understand these differences, so that your code can use the correct programming style for the programming mode you select.
Difference 1: Order and control
Difference 2: What happens when a processing function is called.
