Explain Figure 4-14. Search the Internet for an example of horizontal and vertical market software (other than those mentioned in this chapter). Search as well for the product QuickBooks. Briefly describe the functions of that product. What operating system(s) does it require? Suppose you wish to install and use QuickBooks, but you need some functions to be altered. Search the internet for vendors or consultants who could help you. List two or three vendors or consultants.