Using the four basic application types introduced in this chapter, classify the following systems and explain your classification:

■ A point-of-sale system in a supermarket

■ A system that sends out reminders that magazine subscriptions are due to be paid

■ A photo album system that provides some facilities for restoring old photographs

■ A system that reads web pages to visually disabled users

■ An interactive game in which characters move around, cross obstacles and collect treasure

■ An inventory control system that keeps track of what items are in stock and automatically generates orders for new stock when the level falls below a certain value.