17 Taking an overview of ICT systems
I'm going to pause here to try to put together some of the ideas we have encountered so far. I deliberately chose the example of a supermarket to illustrate some of the key processes involved in an ICT system. Figure 15 is a modified version of the block diagram for computers in a network (Figure 11). I have changed the labels in order to represent the networked computers in a supermarket. I have also added the second user, as in Figure 13. I'll now take each block of the diagram in Figure 15 in turn and examine what is involved. This is a 'walkthrough' of the networked computer system and it will help us to highlight the important processes that take place in each block.